15.0 mpg to 21.6 mpg!

Going to bow out of this topic. Guess the Big 3 have been doing it wrong for the last 100 yrs. And my 37 yrs in engine calibration means nothing. Good luck on your quest. Try not to burn a piston or wash the oil off the rings.
Seems you're taking this personally, I don't know why. I've not said you're wrong. I spent 12 years working for OEM's. Not in engine design however. Edelbrock has been making carbs a few years, so I trust their numbers and their tables. I've been tuning for a few weeks. But in that time I can say, no way in heck my engine will idle, at least not well, trying to achieve 14.7. It would have so mean lean spikes (misfires), it would be horrible and would barely read 14.7 because it would continually jump above that due to misfires.

I can make a video and compare the 2 idles. And attach the video here. I don't know, maybe I'm wrong. All I know is, my idle is decent at 13.0, and starts breaking up linearly as I increase that AFR.