Small block Chevy 400 V8 main bearings can be made to work with a stovebolt block, but it's not an easy job. Both block and crankshaft modifications are involved. Those bearings are dirt cheap and plentiful, however, and they can be used to salvage a "worn out" crankshaft that would have to be scrapped otherwise.

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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!