A Duke 95HP engine in the heavier Fiero GT would result in very poor performance. I would just try to find a 3.4L 93-95 Camaro P/R engine long block that will utilize most of the 2.8L bolt on parts and provide 20 more horsepower. From what we read here this will pass the draconian CA emissions requirements.
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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 "