I am attempting to put a z303 cam in a 302 and am having some serious valve to piston clearance issues. The heads I bought are aluminum procomps with +.100 length valves. I have not bought any pushrods yet as I can't get my length to come out yet, i am using a pushrod length checker to actuate the valves at different lengths. Flattop pistons w/ 4 valve reliefs. I have tryed fly cutting and am afraid of cutting to deep. Please help thanks