[wbnapier]

This stuff is hard to troubleshoot online.

Do you have the block off plates for the end carbs installed? I'd block them off to eliminate the chance of a vacuum leak on the outboard carbs.

Then, run a fuel line from pump up to carb. Unhooked, have it run into a bucket and have a helper start the car. Is fuel coming out? Consistently? This is after the inline filter, so we will know that the carb is getting fuel and the pump works.

Then, with fuel in the bowl, install the airhorn and actuated the accelerator pump and visual confirm it's squirting.

I have to ask, any chance on ignition issues?