I have a Lt1, all stock from a 1995 Z28 camaro. I am planning on swapping out my crappy 305 with this motor. I want to do some upgrades on it before i put it in. I have not pulled any of it apart yet. Was wondering if the rocker arm studs in the aluminum headed Lt1's are pressed in, or are they the screw in type? Also, what kind of rocker arms can i use to upgrade? I was thinking or comp cams pro magnum 1/6 ratio roller rockers. Any suggestions????

They are screw-in.

3/8'' also correct? and do they use self allinging rockers?