318 exhaust manifolds on a 360

I put the Dakota manifolds, with casting numbers 76 and 77, on my 72 Khuda with the 318. They fit tightly against the power steering and I even had to grind some of the wall external to make adequate clearance. I really love them, I think they are about to Outlook diameter, but I opened it up to about 2 1/4 with some grinding