Ok, one more question on the Holley jetting.

DrCharles said
I am having a similar problem to the OP (too rich off-idle) since I replaced my baseplate with a Quick Fuel.
It's simpler (once all the orifices have been converted to replaceable) to enlarge the IABs.
Wouldn't that be worth trying first?

Me personally when it’s that far off I prefer to get the IFR where it needs to be or really close and fine tune with the IAB.

Others may have a better way to do it.