68 chevelle rear end swap

Hi i was warndering which rear end would fit my 68 chevelle i mean from what other years or models, trucks or cars would fit? i am looking for a set of 8.2 2.73 gears thanks. i am looking at replacing the whole rear end if i can find one maybe a 8.5" i have a set of 2.73 8.5 gears i just need a doner housing.
thanks jim.