There should be plenty of material on the tip to allow for substantial regrinding without adding any metal. The clearance at the rocker tip is approximately 1 1/2 times the movement of the adjusting screw on the pushrod side- - - -no problem with removing a few thousandths at the tip to reshape the contact patch. Running bronze bushings instead of steel on steel should dramatically reduce the wear involved. The Chevy engineers never intended these engines to run for 70+ years- - - -maybe 10-15 at the outside?
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!