There could actually be a couple of more sinister reasons for your issues:
- warped main body casting
or
-pourous main body
I know I have posted these pics before, but with your problems you need to know.
The two carbs were fly cut. One has a pourous casting. It also did not clean up after a .005 cut. Worse yet the lowest spot is the accellerator pump circuit transfer boss in the middle. Just sayun'...
