Bought the car for about $2500, and did the basic fluid changes and tuneup.
First minor change was to put in some new speakers and a cheap CD/head unit, the cones had desintigrated on the originals so I figured anything had to be better than those LOL. Got new black carpet and a new set of floormats.
First major thing done to the car was suspension/brakes, just seems like the logical place to start to me. Basic suspension stuff, poly (including cradle bushings and dogbone), suspension tech springs, a couple of ball joints, etc. I'd call it a mildly upgraded suspension. The brakes are stock, just new rotors, front calipers, and pads all the way around. Flushed the system real good and buttoned it back up. Stripped the stock wheels and painted the center a gloss black and threw some Dunlop SP8000's on them. I had the shop that did the alignment check for any problems and they said everything looked good that I had not replaced so I figure I'm done with the suspension for a while. I'm sure in the future I will be replaceing other ball joints, tie rod ends, etc, as time and funds allow but for now everything is up to code. With the tires I think I ended up spending around $1500 - $1600.
Second major project was a comfort thing! A/C was refreshed replaceing hoses and heater core for good measure. Even with replaceing the compressor, accumulator, seals, hoses in the engine bay, etc, it came in at around $700 - $800.
Third major project was the drivetrain, I had big plans for that but as usual things rarely go as planned. I opted for a refresh of the existing motor/trans with the help of some of the guys here on the Forum. I replaced all of the sensors, cat back exhaust (stock replacement), motor/trans mounts, injectors, etc, etc. Think I ended up at a little over $1800 on that.
There are a lot of things I would like to do to the car, I think like you mentioned, they are never "really" finished. I kept up with some of the parts and costs on mine, not a complete list but I think it's most of the big stuff. I haven't added everythng up but figure including the original purchase price I have maybe a little over $7000 in the car. The only labor cost was the alignment.
Here's what I do have a record of, I'm sure some of this stuff can be had cheaper.
New Parts:
52370 1 84-88 THERMOSTAT $9.95 -- $9.95
51408 1 85-88 V6 FAN SWITCH $44.95 -- $44.95
52463 1 84-88 OXYGEN SENSOR $35.12 -- $35.12
52461 1 85-88 COOLANT TEMP SENSOR $21.52 -- $21.52
52460 1 85-88 V6 AIR CHARGE TEMP SENSOR $29.95 -- $29.95
51438 1 GROUND STRAP $4.95 -- $4.95
66628 1 84-85 TEMP GAUGE SENDING UNIT $22.95 -- $22.95
51401 1 85-87 OIL PRESSURE SENDING UNIT $44.95 -- $44.95
51403 1 85-88 V6 OIL PRESSURE SNDING TUBE $34.95 -- $34.95
52387 1 A/C COMPRESSOR BELT $7.95 -- $7.95
52386 1 85-88 V6 WATER PUMP/ALT BLT $12.99 -- $12.99
52315 1 85-87 V6 COOLANT HOSE KIT $45.95 -- $45.95
09651 1 BOSCH SPARK PLUG WIRE SET $28.88 -- $28.88
2771 6 NGK UR5 SPARK PLUGS $1.85 -- $11.10
D314A 1 AC DELCO DISTRIBUTOR CAP $10.00 -- $10.00
D446 1 AC DELCO DISTRIBUTOR ROTOR $4.01 -- $4.01
A925C 1 AC DELCO AIR FILTER $5.45 -- 5.45
70822 1 FELPRO GASKETS OIL DRAIN PLUG 0.43 -- 0.43
70672 1 FELPRO OIL FILTER 0.66 -- 0.66
54401 1 85-87 V6 PERFORMANCE HEADPIPE $39.95 -- $39.95
66450 4 85-88 CROSSOVER PIPE TO MANIFOLD BOLT $3.50 -- $14.00
54501 2 84-88 EXHAUST BOLT AND SPRING $6.95 -- $13.90
52797 1 87-88 V6 EXHAUST FLANGE GASKET $10.69 -- $10.69
77355A 1 85-88 V6 STOCK EXHAUST SYSTEM W/O TIPS $199.95 $199.95
CCA-1414-12 1 COMPCAMS 1.6 STEEL ROLLER ROCKERS $135.69 -- $135.69
ES72857 1 FELPRO HEAD BOLT SET $29.99 -- $29.99
MPR-342 12 MELLING PUSHROD $1.29 -- $15.48
JB-2095 12 MELLING HYDRAULIC LIFTERS $4.99 -- $59.88
VLVE JOB 2 RECONDITIONED HEAD $107.00 -- $214.00
10734 1 FELPRO HEAD GASKET SET $14.82 -- $14.82
47772 1 FELPRO INTAKE MANIFOLD GASKET SET $24.19 -- $24.19
52740 1 FELPRO VALVE COVER GASKET SET $17.01 -- $17.01
52736 1 FELPRO EXHAUST MANIFOLD GASKET SET $23.95 -- $23.95
67565 1 FELPRO DISTRIBUTOR O RING SEAL $1.95 -- $1.95
88100 1 85-88 EXHAUST MANIFOLD STUD KIT $14.95 -- $14.95
51404 1 84-88 TEMPERATURE GAUGE SENDING UNIT $33.17 -- $33.17
52910 1 FRONT TRANSMISSION MOUNT $21.95 -- $21.95
52920 1 REAR TRANSMISSION MOUNT $24.95 -- $24.95
52799 1 85-88 V6 ULTIMATE DOG BONE $49.95 -- $49.95
52900 1 FRONT ENGINE MOUNT $32.95 -- $32.95
60561 2 84-87 REAR CRADLE BOLT $3.95 -- $7.90
57519 1 84-88 FRONT ENGINE CRADLE BOLT SET $9.95 -- $9.95
PTP-7-2034 1 PROTHANE FULL BUSHING KIT $76.99 -- $76.99
PTP-7-502 1 PROTHANE CRADLE MOUNT KIT $34.99 -- $34.99
ZX811872T 1 SUSP TECH FRONT LOWERING SPRNGS $83.99 -- $83.99
ZX811873A 1 SUSP TECH REAR LOWERING SPRNGS $83.99 -- $83.99
184188S 1 CARDONE FRONT BRAKE CALIPER $19.48 $19.48
184187S 1 CARDONE FRONT BRAKE CALIPER $26.96 $26.96
56023 1 84-87 BRAKE ROTOR PACKAGE (4 ROTORS) $125.82 -- $125.82
57016 2 84-87 UPPER CNTROL ARM BOLT & WSHERS $9.95 -- $19.90
57015 2 84-87 LOWER CNTROL ARM BOLTS A& NUTS $7.95 -- $15.90
5921 2 MONROE FRONT SHOCK ABSORBER $27.83 -- $55.66
K5292 2 MOOG BALLJOINT UPPER $32.50 -- $65.00
SA1998 1 MONROE STEERING DMPER HRDWR/PARTS $4.84 -- $4.84
SC2943 1 MONROE STEERING DMPR STABILIZER $27.23 -- $27.23
55189 2 84-87 FRONT WHL BEARING NUT WSHR&PIN $4.95 -- $9.90
58500 2 84-87 FRONT OUTER WHEEL BEARING $4.75 -- $9.50
58501 2 84-87 FRONT INNER WHEEL BEARING $6.32 -- $12.64
58508 2 84-87 FRONT WHEEL SEAL $2.76 -- $5.52
79261 1 84-87 FRONT CARBOMET PADS SET $37.40 -- $37.40
79262 1 84-87 REAR CARBOMET PADS SET $37.40 -- $37.40
71814 2 MONROE STRUT ASSEMBLY REAR $48.80 -- $97.60
63620 2 MONROE SHOCKS BOOTS/ACCESSORIES $13.72 -- $27.44
AK-30 1 MONROE SHOCKS MOUNTING KIT $7.44 -- $7.44
ACC-150615 1 ACCEL 15LB FUEL INJECTORS $216.69 -- $216.69
????????? 1 BOSCH NEW WATERPUMP $45.69 -- $45.69
54900 1 84-88 AUTOMATIC TRANSMISSION SHIFT KIT $44.95 -- $44.95
54856 1 84-88 A/T TRQ CNVRTR LOCKUP SOLENOID $34.95 -- $34.95
61371 1 85-88 POSITIVE BATTERY CABLE $16.95 -- $16.95
63646 1 85-88 V6 BATTERY GROUND CABLE $13.95 -- $13.95
DL7194-6-12 1 DURALAST 94 AMP ALTENATOR $69.99 -- $69.99
DL6312MS 1 DURALAST STARTER $64.99 -- $64.99
2.8 SHORT 1 CME REMANUFACTURED 2.8 SHORTBLOCK $659.96 -- $659.96
68514 4 84-88 BLANK CENTER WHEEL CAP $8.95 -- $38.50
50897 20 84-88 LUG NUT COVER $1.25 -- $25.00
H6054ST 2 SEALED BEAM LAMP SYLVN $19.98 -- $39.96
?tires? 2 Dunlop SP8000 245/50-15 $158.00 -- $316.00
?tires? 2 Dunlop SP8000 225/50-15 $138.00 -- $276.00
???? 1 MAP (mass air pressure) Sensor (whadeduck) --
???? 1 TPS (throttle postion sensor) (whadeduck) --
Carpet, floor mats, stereo, aren't on that list along with several other odds and ends but I think that was most of the major mechanical parts.
To get the car to where I would like it to be would be another 6 to 7 thousand I'm sure but right now it's very driveable and there are no pressing issues. Still beats a 3 to 4 hundred dollar a month car payment and right now I only carry liability insurance so thats less than $300 a year. Not to mention tag, thats about $30 a year, last new vehicle I owned the tag was over $160 (payment on the vehicle was close to $600 a month).
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Don't take life too seriously -- you'll never get out if it alive.