I have a buddy who is having troubles getting headers to fit. He has a '72 Camaro with spread port Brodix -11x heads. I know that someone else has to have a similar set-up. Anyhoo, he ordered a set of Schoenfeld headers (from Schoenfeld) made specfically for the combo. They don't fit. They hit the floorpans. Schoenfeld said that the heads have a raised exhaust port which is causing the problem.