1920 Carb

I have a '73 Duster with 39k on it. It has 225 with a Holley 1920 1 brrl. It appears to have CARB emissions. (California car)

It has a dead spot under quick acceleration. Sometimes it will stall out, sometimes I can keep it running. It acts as if it is not getting enough gas then. Runs great if you go easy on the gas. I need to feather the gas to keep running to rev up faster without stall.

Question.... Do these have an accelerator pump? If so where? I have looked at diagrams and not found one.

How does it get that extra squirt of gas when needed?

I wonder what vacuum lines can be removed? It has the delayed advance to the distributor and I would like to eliminate that.

All my other slants have 2 barrels and I know those carbs....not this one.

I could swap out my intake and go with a 2 but this car is very nice and I want to keep it close to original!

Thanks