Hey Al,
Welcome to CHR! Glad to have you here, and looking forward to watching your build. I've not done a 3x2's setup myself, but I've studied them a bit so I'll offer a couple of comments. Set up right the center carb of the set acts as the "primaries" of the group, and that's the only carb with an active idle circuit. The two outer carbs are secondaries, and they only come into play from about 50% throttle (adjustable point) and up, going full open as a matched set of three. This gives you the benefit of running a single 2-barrel for "normal" driving and cruising, until you put your foot a little deeper into the skinny pedal and you then start proportioning four more venturi's into the mix. They look trick, and I believe that a good progressive linkage is a pretty straight forward mechanical adjustment.

Do you have an original '33 with Henry's steel, or are you working with a replica body & frame?