NO, unless you try to adapt the Fiero compressor. To use the more efficient 3800 compressor. You will need special connecting hoses with the GTP compressor end and the Fiero connector end that attaches at the firewall. IIRCF, one hose size will need to be adapted. The hoses are easy to make up IF you have an A/C hose crimper. You will also need to attach a nipple to the high side line where you can fit a refrigerant pressure sensor that routes to the PCM for A/C control. A while back we did a thread on hooking up the A/C system in a 3800 swap. See if you can find it. Loads of good info there.
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "