yes they have screw in studs. im trying to find correct pushrods. the pushrods from the 79 460 measure 8550 i took a length checking pushrod 1/2 inch longer than stock and it looks like it would work. closest ive found is an 8650 or 8700 or 8.750 for 429 scj or a 9.250 which is a big block chevy rod.hoping paul kane would know which ones to use. im running a hydraulic cam if that helps. any info would be appreciated i know im not the first to run these older heads for more compression the heads hve been rebuilt with hardened seats stainless steel valves and have had a healthy port polish job. they dont apear to have been suface milled so im hoping to raise compression from 8.2-1 to 9.8-1 . again if anyone can help id appreciate it. mark....