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Or... it's still very possible he's got restricted petcock. Not flowing enough fuel from gimpy leaky vacuum diaphragm. Or leaky vacuum hose between carb & diaphragm. Something instrumented testing would deny or confirm. Such as measuring actual vacuum delivered by carbs to petcock. And measuring how much fuel flows in 30-seconds into measuring cup. Then we can at least rule out petcock as contributing to issue.
NASA doesn't send things into space on gut hunches. They actually weigh their spacecraft and know exactly how much mass it has. And they actually measure thrust-output of their rocket-engines. With those two numbers, it's very easy to know if the thing's gonna take off or fall over on launch-pad. But without numbers... endless guessing game.
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