Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

Alright so forgive me for asking a million questions but I’m trying to see if I’m truly grasping the fuel circuits.

So the idle circuit contains the IFR and idle air bleed, and it controls the idle circuit and the transfer circuit. Low speed, low throttle situations are running on this circuit.

The main circuit includes the main air bleed, emulsions and main jets and isn’t really doing anything until 2500ish rpm when the Venturi is strong enough to pull the fuel through the boosters.

The emulsion ports are mixing air and fuel through the PMJ and air bleed and sending it through the booster, and any ports above the bowl level are mixing air, below the bowl are mixing fuel. So blocking off the middle port which is right at the fuel level will essentially make it a 1:1 mix of air and fuel (I know it’s not literally what’s happening but 1 hole is fuel, one is air so that’s my idea for the 1:1 ratio.)

Is that the correct or at least right track logic?

I’m also planning on just buying some brass set screws most likely, I’m assuming brass is the universally accepted material. Should I go with 1/4 long or 1/8 long?