I have a Wheeler Schebler Model A carb on My 17-30 (pre type) The parts books does not have a very good breakdown of tractor numbers the had kingston, stromberg or wheeler carb.
My Tractor is #4125 and Tractor Test #118 is of tractor #3972 and that was tested with a Wheeler Schebler Model A Carb.
The Wheeler Carb for the Type B was a tad bit different, so far as the pictures I have gotten between the 2 types.
Again the sky is the limit since there isn't anything really to go by. I am trying to make my tractor similar to those tractors I know are known to be of similar age.