I run Hooker 5903’s on my 67 B-engine combo, so not exactly an apples to apples comparison, but they fit nicely with no modifications needed. I’m not discounting all the other responses from those of us that have had fitment issues with Hooker products, but I hardly think it’s fair to single out the headers as the problem on a combo that includes an aftermarket K-frame, aftermarket steering, and raised port heads. Let’s face it, if off the shelf headers DID fit the OP’s combo, then they are way wrong.