I've had pretty good luck with using the thin stainless steel strip that secures the rubber in a windshield wiper as a shim behind a rope seal to make up for wear, or a seal surface that's been ground undersize. Use a few drops of red LocTite to help secure the shim to the block and main bearing cap before installing the seal.
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!