There is no need for a progressive linkage with the Carter-Weber progressive 2-barrel carburetors. I think that is a 32DFT that was the carb mentioned in the original post. These were used an 1.6 liter Ford cars.
Also, one of these carbs would work, but one of these carbs would be too small for a 235 engine. Two of these carbs are nicely matched to a 235, and the progessive two-barrel design results in very smooth acceleration and efficient operation.
You most likely have one dirty carburetor (or, one defective carburetor).
