What other rear ends will work with my Dart?

I have to disagree with you here. If the spring perches on the b body rear are moved in half an inch on each side it's a direct bolt in with wheels with proper offset. More do it yourself types can reweld perches than can shorten and balance driveshafts.And it stays all mopar.
Daredevil are you saying I can get rid of my 7 1/4 and have a bolt in ready replacement without shorting my axle?