Big block HP exhaust manifold flange

TTI B-body head pipes come real close to fitting (better with a B than an RB), BUT if you tell them what you are putting them in they won't sell them to you (I had to get my TTI dealer buddy to lie to them). As I recall, the B-body four speed driver side pipe fits better with an auto in an A-body. At one time we had about three different sets to experiment with.