Sadly the old Innovate message forum got nuked. (Innovate O2 indicators) .
10 years ago a poster with the handle “tuner” had excellent insight on tuning Holley and Holley based carbs. He included some theory as well as practical application.
The cool thing was his insight help one “see” the function of each circuit and how the overlap,transition,one to the next effected driveability.
I also learned the whole carb too big on the street thing is sort of a myth ,but a small carb is easier to tune on the street because there is a lot less to explain. Idle is idle,main is main jet, power is ….well main jet.
Now a big carb it’s IFR,IAB,idle mixture screws,Main Jet MAB,PVCR,PV,secondary …..you get the idea.
At the time the 850 Demon came on a brand X crate motor,and everybody that cared tossed them because they sucked driving around town. I got mine for $50.
I ended up with every hole drilled and threaded for replaceable jets,IAB,MAB,PVCR,IFR .
I tuned that thing to 18mpg in my FE Mustang and 12.0s in the quarter.
It ran great.
I also learned that back in the olden days hot cars came from the factory.
The best OEM tuned Holleys are the last ones fitted from the factory. Look at the ‘vette 3310 or the CJ 735,later the 351c carb. You will find excellent low throttle angle tuning and driveability in those carbs.
Three modern tools will teach ,if you pay attention ,which area to tune. O2 indicator,vacuum gauge and tach.
WOT can still be done with a drag strip and reading plugs but drivability can be nailed with feel and tools.