[John Fitzpatrick]

Doc
The lateral carb separation is 175 mm. Height above base plate of the carb shafts is 19.7 mm and 16.9 mm for the central shaft. Center-to-center length of the carb arms is 28.6 mm and for the center arms, 30.1 mm.
I can shim or shave the pillow blocks to tweak the center shaft height above the plate. As you can tell from the photos, I still have a lot of work to do and if this doesn’t work, Jay Cushman has a really nice linkage almost ready that looks a lot like yours. We shall see.

I did find some actuation arms that just need the spacer washers with rectangular holes brazed on, so that’s 1 ½ steps forward anyway.