Need a little guidance from the gurus

A '72? Good. Trans Dapt makes a inexpensive swap kit so someone research.
I like the engine torque strap from these guys in addition. http://www.engine-swaps.com
Search the junk yards and classifieds for a truck or van for a Magnum. With the Lowest of mileage of course. My particular engine I used was out of my daughters wrecked Durango with 80K. It still had the cross hatch hairs from the day it was made. So don't be so afraid, just bring a wrench and check.

Alright, I think you all have me convinced to stay away from the BB....for now anyway hahaha.

If I did manage to find a wreck with a magnum, is there a certain vehicle I should be on the lookout for so that I can get a rear end with less mods required or will they all require the same (cutting the tubes and moving the perches)?