The Stovebolt Site Forums The Shop Area Engine Shop 235 stalls and stumbles off idle

I just compared both carburetors and they appear identical except:

The original one is a Rochester C (one hole in base)
The rebuilt one is a Rochester RP (two holes in base)

I did compare the bases and noticed the extra hole in the base of the Rochester RP. I swapped the bases and tested runnablility, the same symptom is present.

The gasket I'm using between the intake and the carb base has space for both 1 and 2 hole bases.

The intake manifold looks like it is built for the (one hole) carb

** I bought the rebuild from Mike, I'm just hoping I ordered the correct carb **