Holley/Demon Carb stumble
Can you post a couple of pictures of your spark plugs? Not all of them, just one from each bank. And if you can, take the shell off one of them so you can see the fuel ring.
I’m not sure if you posted what you have for a high speed air bleed, but if it’s too big it can delay the start of the booster enough you’ll get a hole in the fuel curve that you can’t cover up.
Also, since I can’t remember the details...did you install T slot restricters? What about the PVCR’S? Did you put brass in them so you can tune that circuit?
TIA