Very interesting, thanks to you and Steve for doing this.
I'd also be interested in seeing a video on the various period Model A aftermarket "improvements" and what they supposedly brought - Tillotson, Marvel, maybe even a discussion on the various downdrafts that have been used. I think this is what Flathead was suggesting in Post #3 above. I'd suggest focusing on what is commonly seen on the street, not the really hotrodded stuff. Weber, 97, 94, etc. Most folks who run these alternatives, at least those I've spoke with, swear by them.
I did find
this article online which I also thought was interesting.