You don't need a power valve when running wide open all the time.
When you remove it you must increase jet size 8-10 numbers. The power valve allows for less jet to make the thing more drive-able at part throttle...When vacuum drops below the spec on the PV it opens and allows the extra fuel to make up for the 8-10 jet sizes that are not there, but need to be to prevent a lean condition at WOT.
That's my understanding of it Carb guys feel free to corrcet me if needed.