Timing Dance ! Vacume Advance ?

If you compare an 800 and 650 cfm Eddy carb side-by-side the main difference is the primary bore/venturi size. This is why it hesitates; the primaries are too big, which is definitely noticeable more when driving on the street because you use only them 95% of the time. pilotsf you should just try (borrow?) a 650 cfm carb on your engine and see if it improves response. IMO even a 750 is too big for street driving; a 650 might lose 10 HP on the very top end but will be more responsive and better on gas on the street. And if you get the AVS version you can tune the secondaries to react as fast or slow as you want.