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After doing a little research, your 2 barrel Autolite 2150 carb does indead have a vacuum actuated power valve.
Again, the question isn't if more or less vacuum is better or worse for efficiency?, but rather: At what vacuum level does the power valve go from closed to open. Figuring that out and marking that line on your vacuum gauge will be of better help than just going by your gauge's generic "poor/good" fuel mileage drawings.
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