so I finally finish push rod length , Highest lift was .005 over the cam spec. .715 lift. cam is .710 adjusting the checking push rod either way a few thosands has lots to do with proper geometry.I spent several hours deviating from different set screw positions and pushrod lenghths. Hughes instructions are quite easy to understand. They give you a starting point as well, takes guess work out of it! Smith bros. will be shortening my existing push rods!