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3 deuce set ups could be Stromberg 97 or 94 types. A float valve that won't seal or a blown power valve that leaks if its a 94 type will be internal leaks. Fuel pressure is important on the old cars so a lot of hot rodders put a regulator before the fuel block to keep it from being too high. The Holley types can blow a power valve diaphragm pretty easy. The PV numbers would be low for a 3 deuce set up. One of the carbs may not even have one. It just depends on how it was initially set up. Just make sure and match the number up if it needs a power valve or two.