I am going to measure the exact distance from the exhaust bolt holes to the edge of the exhaust port on the edelbrock heads and trace an exact outline on the manifold face to see where I stand. Iam going to do some exhaust port cleanup on the heads first so I need to get that done. Just some light work with sanding rolls..... My goal is to eliminate every restriction that I can and get these manifolds to work as efficiently as possible..... Hey BSB, I did not really pay attention to your car until now and that thing is awesome!! 11's with exhaust manifolds and mild gears is quite a feet of engineering!!! What cam are you using? PM me if cant divulge the info, I can keep a secret!! TBF