I had done the calculations earlier and knew that the 96's would be sufficient. However the 120's are pretty much the same cost and would leave me with injector to spare in case I decided to turn up the boost or build a larger motor in the future. I am confident the 120's would idle acceptably well. That said, the discussion I recall was talking about the operation at light load/part throttle. Would the 120's be on the ragged edge under those conditions? The 96's would have a surplus capacity with the current setup, just not as much. For what it is worth I really don't have any plans for higher boost or a bigger motor right now. I just have a tendency to try and overbuild everything. I guess I know I am guilty of the usual hot rodder mentality, if a little is good, then more is better, and too much is never enough. The 120's meet that need. That said, I don't need any extra capacity that reduces the daily operational effectiveness.