Air Bleed Alternatives

Hopefully one of the real guru's on this board can explain the entire process.
Most carbs have two circuits that relate to air bleeds. Idle and high speed. On the Holley and my QuickFuel the outside bleeds on the primary and the secondary sections of the main body are the idle bleeds. The inside bleeds are considered the high speed bleeds. From my understanding, idle bleeds can have an effect on transition and light throttle running. Too lean and the engine can stumble and drift at cruise. Of course primary jetting can also relate to this as well.
Again I am no expert and am just learning myself. It is good that you are getting an AFR guage. That is something I am seriously considering. One question I have is what range of AFR is normal or acceptable from idle to WOT.