Holley/Demon Carb stumble
There’s plenty of guys who have messed with swapping parts around way more than I have........ but I’ve never really had any problems that I can remember with 3 hole emulsion.
That said, I haven’t done very much “cross breeding” of parts from one carb to another.
I also agree with modifying the Demon blocks for adjustable emulsion, which “should” make them more universal.