Good Luck with it.

Make sure you have/use the Correct Power-Valve Gasket. The "Newer" Stepped Power-Valve requires the New Thicker PV gasket to seal.

Experience: Couple weeks back, I bought a brand new Holley Factory Power-Valve and used the "New" gasket included in the package.

It turned out to be the Old 1/2-thickness gasket that the factory included. I didn't notice, and had fuel leaking past the power-valve 100% of the time, draining the fuel-bowl, etc.