PS Pump- Nothing 86-87/TTA only. Similiar type of pump is used on other cars but the internal valving is different.
Alt. Same basic 120A is used on 94-97 LT1 F/B/D-body. 120A units from 88-93 4.9 Cadillac will also work with your old cases.
AC Compressor. 4.3 V-6 S-10 and 3rd gen F-body with serpentine belt is the same.