When I say the motor "likes" the AF -- and the VE's are right or very close - The RPMS and the Vacuum should both "INCREASE" (at idle) just like tuning a carb - you set your idle mixture using your tach and vacuum gauge - you know you have 'em right when you achieve the highest RPMs and highest vacuum reading...
So watch those two when you're "tuning" the AF...
No load idle - should be able to get fairly 'lean' on the AF... but I don't know what motor you're running or cam etc... so the numbers I'm throwing out are just that - numbers.
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