72 Scamp and 440

Congrats on your project! I just picked up a 74 Dart for $3K and am planning an RB swap too. My experience with the rearend sawp is that an 8-3/4 or Dana 60 takes less hp to turn than a 9-inch, are cheaper to buy/build and are very durable if you put the right parts in them.

Good luck!