I have a 76 sbc with RV cam, performer intake and carb.This motor new had a low CR,so looking to vortec style heads, but would like to keep my intake.I think Pro Comp aluminum heads will take my intake.Are these heads any good? I don't really care if it's aluminum,so if you can recommend a head,please do.From what I read today a dif cam might be better too.I won't be rev' g over 4000, just want a driver motor. Cisco.