My 312 in my 57 Fairlane had a front crossover, if I remember correctly. Try putting a 440 in a 65 Dart with no fenderwell mods. 2 of these manifolds would equalize the exhaust performance and free up room where its needed. This is also used in making turbo applications, sometimes even putting them upside down so the turbo is over the valve cover when the bolt pattern allows. Just make it work...