I am in the same position in that I want to keep my 14" rims but would like to upgrade. I saw they are selling repo Camaro 4 piston calipers and rotors. Seems like they may work but that is only a guess. I posted earlier but no one responded. I always thought Firebird and Camaro shared the same caliper it was just the internal piston size that changed.

Anyone out there have original 4 piston brakes that can shed light? What are the stamp marks on the originals.