Stalling Issue (Slant Six w/Holley 1920 Carburetor)

Have you looked into the carburetor throat to confirm a steady strong stream of fuel when the throttle is opened? If you have that, then refer back to posts #2 and #3.

How is the choke adjust exactly? In Pennsylvania, it's probably pretty cold in the mornings now. You should have the choke adjusted so that it snaps shut fairly well when you open the throttle first thing. The choke should have noticeable resistance when you open it with your finger. In other words, it should want to close "pretty good" when you remove your finger. It's simply something you're going to have to experiment with.

Another thing to check is the ignition timing. All too often carburetor issues are not carburetor issues, but timing issues. Where is your initial timing set? With today's crappy's gas, you're going to need more initial timing to help it run better. I have mine at about 12* BTDC and it runs great.

Referring back to post #3, you cannot hurry these old girls when they're cold. They don't have EFI. They must get some heat in the system before they run their best.