I’d be willing to bet you’d get more out of a swap to more carburetor than a either of the single planes you mention, Ron; or really any manifold swap for that matter. You drive your car on the street a lot, so I’m not sure a dominator would ultimately be your best choice. Dom would likely disagree with that, and could likely build you a 4500 that would work seamlessly on the street; but that would be a fully worked and re-calibrated unit.

It just sure seems that the Indy 2D with a good 1000cfm based 4150 would be a tough system to beat on your car. I recently found a way to put an open 1/4” spacer between my 1000HP and the RPM, and blended back the top and divider of the RPM plenum, just trying to get more open plenum area, and my car seemed to respond well to that mod.