From Dave Hughes & co: At 60% of total valve lift (50% if BB) the centerline thru the pushrod and adj screw should be a straight line viewed from the front of the eng. Shorten/lengthen the pushrod and or saddle shims (or milling) to achieve it. 1-2 threads showing and include the lash if it's a solid cam/lifters & if hyd use a junk hyd lifter w the cup welded solid. Then rocker tip side alignment & shims on the shaft to correct that then check the wipe pattern.