Holley 4779 specs?

That's a good idea. I planned on opening it up this weekend anyway.

The reason I ask is the old 4779 I've got needs the PVCRs opened up a bit. The metering blocks on it are from a 4777, so I'm assuming the PVCRs are a bit smaller them, which is why they need to be opened up.

Any idea how much of a change in PVCR size makes much of a difference? Are they like IFRs, where a tiny change can make a big difference in AFR?