Did something similar using Max Wedge exhaust manifolds on Eddys in my '63. Had to grind the bottoms of the manifolds a little to clear the head studs. The front of the right head is covered by the alternator, but the left head gives it away. For a more stock look, the 440Source heads would be better, but they weren't available when I did the car. It's nothing radical, but it makes plenty of power for the street.