Stalled due to research. Dennis Lacey sent me some great reference pix of a real head, but I went off down the rabbit hole of what would have been the absolute trickest carbs to have used back then. I settled on either Amals or SUs, which, as side-drafts, would have eliminated the 90o direction change in flow from using down-drafts. Easily worth a few HP. As a what-if, state-of-the-art car built by somebody with knowledge of European practice as well as American, these would be naturals. Anyway, that's where she stuck. I've been looking for the easiest-to-scratch-build, or some old ones that look like the stuff from the '50s I can copy.