Holley/Demon Carb stumble
What are you working with right now?
new body, new baseplate, Demon blocks?
Looking at your “build sheet”, it would appear much of what you’ve listed for orifice sizing on the Demon blocks doesn’t agree with the specs in the catalog.
After thinking about your rich idle situation....... and the fact that you can get a .054” drill bit pretty far into the IFR....... if just doesn’t seem to want to come around....... I’d replace those with “fresh” IFR’s that were the desired size all the way through.
The length of the restriction is a factor(at least it is with jets).