I'm currently conducting an experiment with "xLURKxDOGx". I've agreed to trade a set of "machined" 360 magnum passenger and "machined" 360 Dakota driver manifolds in exchange for a regular pair of 340 manifolds. He has an early A Mopar and plans to have the engine to manifold surface machined to get more clearance on the steering box. This has already been done by "eestatic" (FABO member). "xLURKxDOGx" has agreed to post his progress on this installation for other members to see how it's done. I sell Dakota driver and 360 magnum manifolds that have machined out to 2 1/4" (exit hole) just like the 340 manifold. I know that early A folks want alternate solutions to their exhaust issues so I've been actively trying to get someone to conduct a good experiment to show that there are good, inexpensive alternatives to headers.
Either way I plan to ship "xLURKxDogx" a set of my machined manifolds to try on his early A.
treblig