I've used a set of Hooker fenderwell two inch primary pipe on both my 1971 Duster with two different motors,440 and 400 stroker, with Eddy RPM heads and the 1969 Dart with a 440 with iron heads and the 383 before taking them off I would put the heads on and try the headers, worst case scenario is there are problems Probally not as no one has bruoght that up on here that I can remember Maybe that is why no one has said anything else