Rearend question for a 65 Cuda

What's the biggest, beefiest rearend that I can get with the small bolt wheel pattern that would be a bolt in for my 65? Even if it ain't a bolt in and I have to move some spring perches, that wouldn't be a problem.

Just some extra info here. I'm planning on a 360/4spd combo and I know that neither one of my stock 7 1/4 rear ends will stand up to how I plan on driving this car.:burnout: