Bent rear end!!! :-(

well after i just threw a new pair of BFG's on my rear rims i noticed something...

well i was admiring them i noticed that my rear wheels had a pretty bad negitive camber!!!!

WTF!!! never noticed this before, so i crawled under my car to have a look and sure enough, BENT HOUSING!!!!

how does this happen?? i haven't had her that long so thats why i didn't notice this before...

nothing else looks bent so i'm ruleing out the "dukes of hazard" theory, :-D!!!!

anyway, my question is.... i'm just gonna replace the whole rear end, what kind of car(s) rear end is compatable with mine so i know what to look for at the wrecking yard?? also, what gears should i run, or should i just pull my ol' gears out and put them in the new housing???

i've got a 1974 dart swinger 318/727!!! thanks!!
try box jeeps. aparently they have 8 1/4 rear ends. u dont want a 7 1/4. try to find a mopar wreckin yard. jeeps have good rears but u need to get spring perches made. im sure u can find one on here for under 500