What heads and head gaskets? And what’s the overall intent of the vehicles usage, and what transmission, gear, and converter? I seen that Hughes recommended a hydraulic roller. Are you planning on the hydraulic roller switch? When you get into milling the heads enough to raise compression and running high lift, it’s a good idea to co talk to Mike at B3 about rocker geometry correction. Those heads have a .060 deep relief cut around the combustion chambers. You can get a pretty decent bump in compression by milling the thickness of the head gasket off and still maintain a .042 piston to head clearance for quench. If it’s primarily a cruiser and you’re changing to a hydraulic roller cam, there are several computer controlled cams available that would make more vacuum and DCR if you don’t want to get into raising the compression.