SIXPACKDODGE...So in the pic on post 3062430 it shows the runner extensions following the as-cast trajectory of the intake. That would be the difference in the way i added runner extensions for the 6-pack. i wouldn't add any bridge in the center and I'd ADD a spacer below the lid. ALSO, I'd use mechanical carbs with a pump shot. I think this is the way I'd do the lower with a single-4 "4500" with a lid like AndyF made...every version of this intake other than a blower needs runner extensions IMO.