I was planing on buying a wide band air fuel ratio gauge to help tune the carb on my Y block. From what I understand, I can weld in a "bung" into the header and install the sensor, run the wires inside the car and watch the gauge then make changes in jet size as needed. I was hoping that doing this would show if I was rich or lean at wide open throttle, then tackle acceleration, to zero in on acc pump discharge nozzle size. Has anyone done this? any tips or suggestions? Running a Holley carb.