I used to build 427 Cobra kit cars. Always used a side oiler in them stroked with a 428 crank. They were getting hard to find then and I had to source the various parts vs a "crate" motor. Tunnel ram manifold is useless for the street-medium riser was the way to go. 2-4's were a bit better than a single quad but for all practical purposes were more for bling than performance. Most of the race cars used a single. I like bling so I used the duals.