It is probably best to leave the PCV as it is for a steet car. There is really just one size power valve used in all Holleys it is the power valve resrtiction channel(PVRC) that controls how much fuel flows through. Most 390's use a metering plate for the secondaries and do not have jets or a power valve. You can buy a kit to add a metering block (like on the primary side) if you want go that way. But the metering plate can't be tuned.
