69 340 problems

I glossed over the whole thread again as a refresher. It's getting fuel, but how good is the fuel? Not sure if you've tried running from known good fuel (gasoline is less dense than water, so if there's a bunch of condensation or something of the sort it'll pick up a crappy mixture and make you crazy). Disconnecting the tank-to-pump hose and running a temporary line from a known good can of gas to the pump is one way that has been suggested. I usually get lazy and just dump about 3 tablespoons through the venturis into the plenum.

If it lights up on the surrogate fuel supply, that takes a bunch of other stuff out of the equation.

I'm just thinking that having swapped ignition parts, carb and such, a big common link is between the gas cap and the carb.