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Hey Sport, here's a simple check you can use to verify whether or not the power valve is actually blown: Turn the idle mixture screws all the way IN. If the engine dies, the power valve is good. One other thing, every Holley carb mfg after 1992 has the check-ball modification done to...

It could be the power valve, but I've usually seen very poor idle characteristics as well, since a defective one makes the carb run very rich. The power valve allows you to run lean at part throttle, which sounds like where you're experiencing stumble (1/3-1/2 throttle), and increases fuel...

74B, Based on your application, and a 7000 rpm shift point, the 750 should work very well for you. Even a race based 360 spinning 7500 rpms requires slightly less than 800 cfm, so IMO the 750 should work great for a car that is primarily street driven. Southernman

Cuda76, you can run either, but you live in the deep south (close to my brother), where high summer temps can wreak havoc on fuel systems. Vapor lock is a major concern here in the Carolinas, and fuel "blending" with alcohol etc can make it worse. In a netshell: The mechanical pumps are...