I agree TGO has a great forum on that with alot of good links. What is the LT1 out of? If it was from a Corvette or if you can get all the accessories from a Corvette no mods to the frame are necesary.
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1987 Firebird Formula
SLP Headers,3in. Flowmaster Catback, l69 dual snorkel intake,SSM sub-frames, 4th gen power leather seats
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