To check stovebolt pushrods for straightness, find a piece of glass slightly narrower than the length of the rod so you can roll it across the glass without getting either end involved. Also check the ball on the adjuster screw- - -it should be perfectly round, without a wear nub in the center. That nub will eventually catch in the depression in the female cup of the pushrod and break the lip off the cup. Rocker arm adjuster screws made for MOPAR V8's with solid lifter cams are the right thread to fit stovebolt rocker arms (7/16-20), and they're available on Ebay.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!