power valve makes my 440 ping??

Sounds like you have other issues that your trying to make the carb make up for or currect, i would check for vacuum leaks around the base of the carb/intake, then check the fuel pressure, & do a volume test & makev sure your getting good supply, I've had issues like this before, found out it was blockage in the factory fuel lines, you need to currect it "fast" before you really mess up the engine.

Like was said, what all is done to the engine, I'm a BB guy & have built a few over the years, & what you need to "always" remember 1st. hand, "make sure" you have very good fuel supply before you start running it, whether there mild or wild, they are "thirsty", i've seen many lack in this area on there builds, i learned the hard way years ago, never deprive a BB for its quinch for fluids, you'll be sorry.