If the tips are that badly worn, what about the condition of the rocker shafts? They have a tendency to wear out on the bottom, especially if the lubrication gets compromised. There's also a fix for that without going to new shafts that are expensive and extremely hard to find.
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!