I think i get the idea on how do do this but, the manual isnt to clean on some things. Ihave Gt-40 p heads. I am installing a set of trick flow springs, a cam, and some 1.7 roller rockers. How do you go about checking/shimming the rockers.I need to know how you do each one. My cam came with some shims, but how do i measure what i need? also tips on installing the valve springs would be great thanks! i just need to know where to have the pistons when adding air to teh cylnders.