This is probably not what you wanted to see, but here are some pictures of my attempt to put a Quadrajet on a flathead. I figure if the would run on a 3.8 liter Buick, they could be made to work on a 3.9 liter flathead. I only had a couple of junk Quadrajets, and I couldn't get it to run worth a shit. I have a bunch of other stuff going on, so I abandoned the project.
I do plan to get back on it some day.