Tunercat makes a software program for tuning earlier GM ECMs and has a definition file for the 87-88 Fiero 2.5L ECMs.
Any ECM prom chip can be tuned but you indicated that you want a race tune. I don't believe that you will be doing much racing with the Iron Duke. It is an economy engine made for low RPM use. An engine designed for 95 HP only does so much.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "