welderskelter wrote:What other kind of carburetors have been tried out on these things?
Either the IH or Zenith carburetor for the IH 60 cubic inch engine work well.
As far as the 2 cylinder Wisconsin carburetor. Perhaps it is suitable for the 60 cubic inch IH Cub engine. Perhaps not. Bad news is that the Wisconsin carburetor is probably a Zenith. The manufacturer, Zenith, changed the jets, venturi, etc., to match the engine manufacturer's specifications.
There are numerous repair instructions for both the IH and Zenith carb on this site. Suggest cleaning and repairing the existing carb before experimentation.
I have also reread your previous posts. Suggest taking a bit of time reading the various manuals for the 154 and standard Cub. Manuals are a free down load, click on manuals at top of page.
Edit: There are several folks on this site who rebuild carburetors. Might contact them.