nobody knows what good AFR numbers are?
The air-fuel ratio varies depending on all kinds of things. What is good for wide open throttle and 6000 rpm is not worth two dead flies at 15% throttle and 2000 rpm, for instance. Your question can't be honestly answered as you have stated it.
Good cruise numbers might be anywhere from 14.0 to 14.7, depending on things like whether or not you want additional cooling from the richer mixture, or better mileage from the leaner mixture. That 13:1 number mentioned earlier I assume was for max power runs, it's much too rich for steady cruise. Others will tell you that for max power you need to be in the mid 12's. What it all really comes down to, however, is that there is no one magic number. Different engine designs respond to different AFR's, and even different engines within the same design family can respond differently to the same AFR's. That's why you need a real professional tuner who fully understands internal combustion engines, and not just a guy who had a one day class at DynoJet to learn how to run the equipment.
Rather than try to tell your dyno guy what AFR you want, just tell him what results you want. If he's any good at all, he'll know what to do to achieve your stated goals. And if your goals are that you want everything, hopefully he will be honest enough to explain to you that it doesn't work that way. Some things are either/or, not all of the above.
Jerry