Re: 4 corner idle adjustment
Robb, only thing you can do is what Holley suggests: keep all screws equal, looking for highest vac and rpm. Then, I go 1/8 turn each corner looking to really fine-tune everything. Then you may find that the rear screws like to be closed a little moreso than the front. When I had a QuickFuel carb, they said it was OK to run all the screws a little different.
I drive the car around for a long trip, then come back to the garage to make the adjustments. You want the carb and intake as HOT as possible, as this is the true operating temp. Simply letting the car warm up to operating temp is not good - I use that for ball-parking the settings. I connect one of them tach/dwell meters, and keep an eye on it. You would be suprised how an 1/8 of a turn moves the tach, where my factory tach and vac guage dont show that.
*69 CHEVELLE SS EFI 502/T56 Mag/3.90
*11 C6, 6.2, 6spd
*96 Stang LQ9 6.0 turbo - everybody should have one!