I have my WB2NB working but here is my experience. I cannot get this engine to idle at 14.7 to 1 nor will it run down the road at that ratio. 13.1 to 13.9 or worse. I have tried adjusting peftbl and this hasn't worked. The f/a stays stubbornly in the 13's. It works fine in full throttle adjustments.
If you have experienced this and solved the problem I sure would like to hear what you did because the car is using way more fuel than it did with the stock O2 sensor.