if u change the air fuel ratio how much of a diffrent would there be in power in quicker in 1/4

If the fuel mixture is correct, (14.7:1) any change rich or lean will decrease performance and fuel mileage. The greater the change, the greater the difference.

for WOT 14.7 is much too lean...but simply adjusting the AF ratio is not going to do a whole lot. If you have a lot of supporting mods, like a turbo setup or crazy NA build, then its worth it and actually necessary...otherwise you're probably wasting your time