1965 Chevy Truck fuel

Hi waltlore, Welcome to 2carpros and TY for the donation

Is this a contact point distributor or an HEI ignition?

When it stalls, does it restart immediately? If not, have a helper crank it while you visually check for spark at the plugs. You can keep a know good spark plug or spark tester in the glove-box, won't get hot. Then you just pull a plug wire, use tester. If you have spark everywhere, I'd have to check fuel. With a rockchester carb, I can pull the airhorn off without removing the carb, check for gas in the float bowl. A clogged exhaust could cause problems, is there a butterfly valve on the exhaust?