A-904+rear end, HP ratings

Just about any '65-74 model that has one if you're willing to narrow it.....'66-72 A-body if you want it to just bolt in. The A-body versions all have small bolt pattern wheels from the factory but aftermarket stuff is readily available to change it to the larger pattern. Stock, they're reliable up to about 500HP with an automatic trans. If you're going to bang gears, I'd cut it off at 450HP. With all the race goodies available they claim they will handle 1000HP now. Same with the 904....it just depends on how much money you want to sink into it to beef it up.