Those lifters can be reground, so don't trash them. Unless they're severely cupped, it's possible to put the proper contour back on the bottom with a pretty simple radius-grinding device in a lathe. I should have my lifter reconditioning setup in operation before too much longer, if some family medical concerns will let me get back to shop projects soon.
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!