First off, it's hard to reply to this since you put a chebby in a Firebird, shoud of used the Pontiac 400, but anyhow. What are you looking for out of this engine?Is this an engine that will just see street use or are you looking for a time slip? If this is just a street engine I'd say that cam is fine. If you're looking for a quick time slip, I'd shave the heads and get closer to 10-10.25:1 and go with a solid flat tappet in the 245/255 @ .050 range with around .550-.600 lift to reallt use those heads, I'd use round a 108lsa and change the rear to around 4.11-4.56 with 28" tires.JMO. If you're looking for both, maybe a solid flat cam with the same specs, but at a 110-112 lsa for a broader power range and keep your 3.73's.