I have always used the fiero stock A/C compressor and lines, the only thing I swaped was the pully from the 3800 compressor which uses the serpentine belt. As for the A/C electical system it is all stock fiero, relays and pressure switches. Never had any problems and still using them to this day, even on the current series III swap I'm doing with the OBD II PCM.
Joe
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Street Legal Tuning.
Specializing in Fiero performance:
3800 swaps, custom Aluminum flywheels, Brakes, Engine's, Aftermarket Bolt on performance parts, used Fiero parts,
e-mail: joetrentadue@hotmail.com