A buddy is rebuilding his 1974 brand X motor and came to me to ask how much cam I thought he could get away with. The truck must be smogged here in Ca. every 2 years. It has an air pump but no cats. I looked at the Summit t catalog and reviewed the Crane cams that are built for computer controled cars and some of these have Carb #s so they are at least a good benchmark. I would like to suggest the Comp Cams Extreem 4x4 210-218 cam ....Whadddaaa ya think??