Is it RWD or FWD / MR2? I have a RWD manifold, which I can't use at all. I'm not sure what difference having a bigport vs smallport manifold is, but I might be buying a smallport head, so I would prefer having the smallport manifold to go with it. Right now I have a bigport head that I'm not sure is usable (one combustion chamber was ground down by previous owner) since I want to do a high comp NA build.