[Mike Taylor 3601]

trying to push off side of valve as in left/right(front/rear of car) ??? if so use adjustable guide plates.... they adjust side to side separately, so you can center rockers, side to side on valves... drill pushrod slots to1/2' in the heads or guide plates won't be doing anything to locate rockers.....
if talking off tip of valve as toward intake or exhaust side of heads... then you are talking geometry... pushrods too short/long... wrong pivot point rocker(AKA wrong rockers...