Do the side gears have hard steel thrust washers between the gear and the carrier? If not, a really accomplished machinist should be able to machine the scored area back a little and fit that type of washer. A lot of later model rear ends had that type of arrangement, and a washer doesn't care if it's in a Chevy, Ford, MOPAR or even a (shudder!) Studebaker!
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!