[asphaltgambler]

Hi - yes that is the one. Their "E" carb is well suited well to your combination. The "G" carb is for larger 100"+ engines. S&S (like Holley) makes great carbs, but only as a starting / foundation point.

Harley engines are 'under-squared' design which means the stroke is larger than bore. When you modify them even just a bit, the air flow requirements @6000 RPM's are huge. Very different animal then say sport bike inline-4 engines; which are 'over-square'. Those engine air flow needs per-cylinder is waaay less even @10,000 RPM's.

All motorcycle carbs have just 2 fuel circuits: low speed and high speed. Modified Harleys need so much air above 4500 that it is impossible to properly jet for mid-range and then WOT. By adding a 3rd fuel circuit (Thunderjet) you then tune the existing main jet as a mid range circuit and the T-jet is set for 4500 RPM and above. BTW, the T-jet draws fuel and then is partially atomized prior to entering the carb throat. So the tune is very precise.

By adding an adjustable air bleed for the main jet (now mid range) you control when that comes in. When set-up and jetted correctly you cannot believe how much difference it makes