Thank you. I don't have the rocker arms, shafts or intake on it yet. I don't plan on using shims if I don't have to. I am using Rhoads anti-pump up lifters and .039 009 head gaskets. I am trying to slow this thing down from a 6.74 @ 103 mph to a 7.50 in the 1/8th to fit into the bottom of my class.