[AC Ventura]

Can anybody help identifying this Quick Fuel carb, which may be a 780 with the auto choke converted to manual. No ID numbers that I can easily see. Fuel feed centres are 9 3/8” and ports 7/8” -20. Also I think the pipe arrowed is called a timed spark port. I guess that’s a little vaccum timing aid. I don’t seem to be using that with my MSD dizzy, so am I supposed to blank it off ?