440 in my 66 cuda

Sorry Bill, if you were doing a 70, 71 or 72 a body I could help you out. If you haven't already talk to these guys cuss they specialize in this swap. I used there mounts and headers for my Demon but I can't be sure with your 66 cuda. http://www.engine-swaps.com/

As already mentioned you'll be looking at suspension upgrades, minimum 8 3/4 rear, sub frame connectors, minimum 3 core shrouded rad, and disc brakes up front but maybe you already know this. Have fun.

Terry