Rearend 7.25 junk????

i have a question for someone that knows more than I do on rearend's I have a guy trying to sell me a 7.25 suregrip out of a 71 Dart that he said when he pulled the cover it had been under water for sometime and 2 teeth on ring gear were chipped. My question is do you think the suregrip is still any good. I know probably bearings and seals will need replaced but is it able to be salvaged. Thanks