Using magnum manifolds

Thanks for the reply on this. I may give it a try and see what I come up with. I need to remove the original manifolds to re-finish and fix leaky gaskets anyway so it will be a good time to see just how much more clearance is needed. I had thought perhaps I could mill the mounting face some along with the outside of the manifold. I know someone who is experenced in welding cast iron and was seriously thinking about some cutting and re-welding if it looked like it cold be done without restricting flow too much.