It sounds like more a volume than pressure problem, I would unhook the fuel line put a rubber hose on it so you can get the gas from under the hood. Fill the fuel bowls manually and start it give it a rev. That thing should shoot like a fire hose.If it dont you found your problem.
A coke bottle hanging from the open hood just gravity feed is enough pressure to run the car full throttle. Less than a lb of pressure. But the volume of gas flowing in is enough. Carbs dont care about pressure like injection does. Just that enough gas is getting there.
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