I am working on an older small block Chevy 350 we put Vortec heads on it. they have had the machining done for the screw in studs and to accept bigger valve springs. Now we are trying to figure out what cam to run? it is a 40 over motor and I am trying to keep building power from 5000 to 7000 rpms wanting to stay in the 500 to 5:25 lift