Hughes rocker arm pedestal shims

The heads were just milled a bit and when
I tried to adjust the valves I could not get the
adjusters short enough, they got where the
cup on the pushrod was hitting the rocker so it
seemed to me the easiest just to shim it up
a bit rather than to chase down shorter
pushrods and it looked like it would also keep the best geometry.

If you're having trouble getting the adjusters set correctly, the heads were milled much more than a "bit". I agree. Correct length pushrods are the right way to do it. I cannot imagine how much in the way of shims you'll need.