The engine will get WAY too much fuel give you that burn-the-eyes type of exhaust maybe blow out black smoke carbon-foul the plugs mercilessly and get fuel economy measured in gallons per mile, instead of miles per gallon, especially around town. Notably, with auto trans, while sitting still idling. Too high of a number, and the PV will be open at all sorts of times that it shouldn't. Then when you reach the PV's operating point, the engine will suddenly get enough fuel, and it will commence to run right, like somebody flipped a switch. Too low of a numbered power valve for your engine, will make the power system not be activated as you press the gas the engine will run MUCH leaner than it should it will do anything from just run real weak, to cough and stumble, all the way to spit back into the intake, from being too lean. As you push it down, the vacuum will steadily drop. Imagine cruising down the road at a steady highway speed and you slowly press the gas pedal down. That is, the valve is open at any vacuum below the number, and closed at any vacuum above the number.
The number is the vacuum required to close the valve. how much fuel it meters, is determined by passages and orifices made into the carb.
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