Rear end Swap

The b-body has 1" more space between the springs, than an A-body. Proper solution is to move the spring pads, but many just spread the springs on the A-body.
65 (first year for non-tapered axle, ) /67, is a bit wider than an a-body 7 1/4 or 8 3/4, but that can be fixed pretty easily by buying wheels with more backspace.
Another plus, the b-body has the big Mopar bolt pattern.