Got me a 4779-6 Holley 750 mechanical secondary with 4 corner idle adjustment. Popped the bowls off and noticed the secondary metering block doesn't have a power valve, and is plugged off. Pretty sure it came stock like that. It's going to be street driven more than raced, but will see some track time. Do you all recommend installing a power valve in the back, or just leave it plugged? It has the stock 80 jets in the rear, but the fronts were changed out from 71s to 67s.