Holley 4779-2 rebuild

I also have a holley 4779-2 and mine did not originally have 4 corner idle, so the secondary metering block did not have a power valve. I am in the process of changing the main body to a proform, and adding a different secondary metering block with idle screws. I'm only going to use this carb to race with though, as now it will have no choke tower.