Just havin fun
, several of the modifications you've made seem reasonably conservative to me, and similar to those I've made for my 1986 Fiero GT.
is those modifications presumably could pick up maybe an additional 10 to 15 horsepower for your 2.8L engine, but not yet as much as the additional 30 or so horsepower required to get your 2.8L up into the 170HP range.
For that reason, and employing much the same reasoning as fierofool
--- but a lower HP input than his --- I recommend currently sticking with 15-pound injectors, the same size as that employed on a stock or nearly-stock 2.8L --- rather than switching to 17-pound or larger injectors at this time.
Another thing to consider is employing what is often referred to on this forum as a "DAWG modification" to enhance airflow through the fairly restrictive neck
of a stock Fiero V6 engine's intake manifold.
Those comments aside, boring the engine 0.030" over (which apparently often sounds
sophisticated to many people) usually can be prudent to help "clean up" the cylinders of a worn engine, but will not add significantly to the HP the engine had when it was new --- and, in fact, it can't!
If one does the math, one will see that that degree of overbore increases your 2.8L Fiero engine's displacement by only a trivial amount --- maybe
to a total engine displacement of 2.9L from 2.8L --- if that
Phrased perhaps less charitably, trivial changes in engine displacement made to what otherwise would be exactly the same engine typically result in trivial changes to that engine's HP, versus what it was when brand new.
The presumably more welcome news is that Sprint headers on a 2.8L V6 Fiero seem to last forever. Also, if later you want to transfer those same Sprint headers to a `93 to `95 pushrod 3.4L V6 "Camarobird" engine which you might intend to use to replace your 2.8L Fiero's engine, you can do that easily with the same Sprint headers your particular 2.8L Fiero's engine already has, similar to what I did with my daily driver `86 GT on New Year's Eve of 2006.
The reason for being able to do that actually is quite simple, albeit likely not yet known universally: The cylinder heads of a `93 to `95 "Camarobird" 3.4L V6 engine are IDENTICAL to those on a stock 2.8L Fiero V6 engine.
Good luck to you with your project, Just havin fun
--- and after just your first post to it --- welcome
to Pennock's Fiero Forum, "neighbor".