Swapping a small block to big block...who's done it?

my friend is doing this in his 72 Scamp, tommorrow were getting 2 440s from the junkyard, one for the Scamp the other for a 67 Coronet. One thing to remember is that its easier to use a B engine (383 or 400) than an RB 440, it clears things better and you do have power brakes with a big booster in the way so thats something to think about. The 400 can be stroked to a 500 i think but all that costs $$. From what everyone says, this cars are amazing and I want to start getting the stuff to do one of these after my Dart is finished. I dont think you can run AC either but I dont know if you planned to. Where in So Cal are you, I stay down here too