[Tom Kirkham]

I would not even think about tuning up a carb with out a wide band O2 sensor. I use the AFX, others use the LM-1 or LM-2. The LM series sensors data log and this is a very nice feature to have. The wide band O2 sensors will save you a ton of time. It also might save your engine. We have found that the most important circuit to get right is the transition circuit (idle to main jets). This is where most of the driving on the street is done. This requires some drilling and tapping in the metering blocks. This circuit needs to be right before you worry too much about the accelerator pumps.