When I bought my dart it came with a clapped out 360. I was able to get a free 360 out of a motorhome with documented mileage so I swapped them. I swapped the oil pan, all the accessories, and motor mounts, then she would have been ready to drop in. The last thing I did was swap the iron 2bbl intake to my aluminum 4bbl and also changed out all the freeze plugs just because I had it out and easy to access.
Point is, the bare long blocks are identical and you only need to swap a couple of the exterior items to get the correct fitment.