It's a pretty good size passage, I might try it sometime.
So I accessed the idle jet from the bottom of the metering block. It is indeed .022" I opened it up to .033" I've JB welded the set screws and will give it overnight to cure before it start it up again.
I guess I would have used a fuel resistant pipe thread sealant.
.033 is a good starting point. Maybe a littlke larger than I would jchanged to in the first test but that's OK. That should give you room to drop the idle timing. Even if it means 10"Hg manifold vac, the restriction is less it may all work out.
As far as IAB and IFR. They do pair together. If you find the fueling is too rich off idle, or it needs a little trimming at idle, open the IAB up.
Don't forget you can also get some adjustment on the idle fuel ratio by changing the transfer slot exposure slightly.
So take the time to try different combos before drilling again.
