The carb is original to the truck. I have a NOS rebuild kit for it, I should have done it myself. I figured out that an AFB will bolt on to the original intake and I have an extra one of those. I'm going to try the rebuilt 4G one more time and if it doesn't work, I'll stick the AFB on long enough to get to the show.
I don't think I would recommend Karb King for a rebuild on a carb that's not mainstream.

'65 C-10, 65 L-60, 65 C-80, 72 C-60 & and a bunch of old Chevy cars.
Never time to do it right, always time to do it over.