The heads on the right are the heads off my Gen V 454. Moretec.com lists them as "oval" ports. However, I have also seen them listed as "peanut" port heads. I set them side by side with an older Mark IV "236" casting which I know is for sure an "oval" port. Side Note: the casting number on my heads is 10114156 My questions is, if you want to go with something other than the stock TBI and intake what options do I have? I'd like to go with the Howell MPFI unit, but if it's designed to work with true oval ports and mine are the peanut ports then they won't match.