Solve the problem the easy way- - - -use AMC/MOPAR/Ford hydraulic lifters. There are plenty of USA made new old stock lifters of that series. They're all the same diameter and height, and it's easy to adapt them to a stovebolt block.
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!