Data - I was using the same carb. You know how it is. When you get a good carb you keep it.

Speed De - The low speed needle is the one on the slide bar. The brass one on the opposite side is the spraybar adjustment. It is not actually a needle (the low end needle enters it) but instead alters the postion of the powerband on the engine. A lot of people use the spraybar to adjust the low end without realising that they are altering how the engine performs.