I have a pair of heads that have 041 as the last 3 numbers in the casting number. They are a semi-closed chamber head with 1.94 valves. I believe them to be originally off a 327 from the mid '60's. I have access to put a solid lifter cam in a .030 over 327 I have. I have some other things collected for this motor including 11:1 pistons, an Erson gear drive and roller rockers. I'd like to use these 041 heads. I take it, I probably should have screw in studs installed? What about hardened seats?