The list of fuel related things you've tried looks pretty good, and should rule out fuel delivery issues to the carbs themselves. However, just because fuel delivery to the carbs is OK, it doesn't mean that fuel delivery to the float bowls is OK. Couple of quick easy things to check:
Have you verified that your float levels are correct? I'm not talking about on the bench. I'm talking about checking through the sight glasses with the engine running.
Did you check the fuel filter screens that are located in the carbs themselves? Maybe they are partially plugged and will pass enough fuel for idle, but not to move the car. If you haven't checked them, it's easy. You can pull them out of the carb bodies without having to take the carbs off the car.
Let's start there because after those two things, it's gonna get more complicated.
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