Rocker to Retainer with Pictures

I can't really tell from the angle at play, but what does the roller to valve tip contact area look like? The clearance should really be closer .050 with the stud rockers. Considering that the Magnum uses stud rockers, I would look into using a longer pushrod. Crower has a pile of various pushrods in their clearance items on their website for pennies on the dollar, you might could come up with some there.
Clearance