holley carb help,transition/stage

scampy said
I do not run any power valves in this carb front or rear. Yes it does have removable air bleeds in the top. Thats part of my question, If I was to go smaller on the iab what else does that change,anything with the timing of the mains coming in or something anything else except richen this idle/transition circuit, or would increasing the fuel with idle mix screws also add fuel to this "cruise" 2000rpm zone or would it just be taking away from the transition circuit. obviously turning the mmix screws would have only a small margin before the idle would but a no go. Does my iab seem off would making a .002 even make a difference

A smaller IAB will richen the upper rpm portion of the idle circuit ie 2000rpm. Your car cleans up at 2500 due to the primary being all the way in. Put .067 IABs in at least the front and readjust idle mixture for best idle. On a race car I set idle mixture to the fat side since you really don't idle much and the motor is run much colder than a street car.
The IAB controls the air allowed in the idle well, the IFR the amount of fuel, the idle mixture screw controls how much of the idle air/fuel mixture goes to the idle and transition slot.