For many years we used MR Gasket bolts . Long before ARP was around . From head bolts SPS rod bolts screw in studs and engine bolt kits . They use grade 8 bolts . And the screw in stud are 7/16-14 at the mounting . 3/8 at the rocker ball . I am installing a set in a pair of 1969 #186 fuellys . And have used them before with a 525 lift cam . They are all that you will need and only $30.00 bucks . Just think of all the Vortec heads running on SB Chevys with the pressed in 3/8s studs ?