I haven't commented on this since realizing a V8 option probably is not going to happen, but I am with Doc on long tubes. Since the design isn't in stone yet, I would suggest looking for design inspiration by looking at the Kleeman C43 headers that they used to sell. these were long tube tri-Y design and made good HP. Headers designed for the C43 would be be the just what you guys need minus one tube on each side.