Tuning a Proform/Holley carb, what parts and tools?

Been messing with the carb for four hours...still running like ****.

I don't get why the ran better than ever the first day, then started fouling plugs and stuttering. If I get on it hard, it wants to die afterwards.
Pulled NGK FR4 plugs again and they were all black. Cleaned with brake cleaner, copper wire brush, and shop towels and reinstalled.Was just trying to get it to run good enough to go to the show, but not sure I'm even going now.

If I rev it fast a couple times at idle in park, fuel comes out the bowl vents.. Pulled my air cleaner to find the base full of fuel...WTF? The onlly things I have messed with are the choke, four idle screws, main idle screw, and float levels.
Float levels are a hair above middle in the window and steady.
Mixture screws are five eights of a full turn out from seated.
Idle screw is three turns in from contact with the arm.
Choke is on fifth notch from center CCW.