Nearly all 84 wiring is only for 84.
Taillights are wired different and uses 2 more relays to have 6 brake/turn bulbs actually work.
Even wiper delay is different and unobtainable decades ago.
I'm told Throttle cable, TBI and other things are only 84 too.
Saving those is work but storing or shipping to X should be easy.
Likely some big items are 84 or Indy only but storing/shipping is harder.
Good steering column and rack is hard to find.
Example:
If don't want the trans cause too big...
save VSS and gear for stick cars. That should work in all stick cars.
For AT, save trans mounts and all brackets even if mounts are dead. Some people w/ later mono-mount might want them and "dead" mounts keep most peaces like nuts/washers in one place. (See my Cave,
Torque Strut)
Saving some parts are iffy at best...
Windshields and plastic tank radiators are 2 of that class.
Note: 84 has Glass sail panels that you need to remove interior to get at panel hardware. Do Not try to pry them off w/o removing panel hardware.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave