750 aed stumble off idle/start

Timing first. Timing, Timing Timing, first..................................Timing first.

Idle timing. Power timing including the rpm at which it is all in by;not some arbitrary number. Cruise timing
Example;
Power timing 38* all in by 3600rpm. Still 38* at 4000
Idle timing with above power timing is 12*@ 700rpm. Begins advancing at 1000
Cruise timing;Dont know/dont care, Im just interested in getting rid of the tip-in hesitation.
See how that works? Now heres the deal why; If you change the idle timing, it changes the idle speed. So you change the speed back. But then you have to readjust the A-pump. Plus you have to limit the power timing so the engine doesn't self destruct.More is not necessarily better.If you change the power timing, well that changes the idle timing, and you are back to that whole thing again.
Then if you change the cam, you get to start all over again. And sometimes going from one exhaust system to another, you also get to start over. Or if you move to a different location at a different altitude, yup, back to square one.
So, if you value your engine,Prove the balancer TDC, and buy a good light,cuz you're gonna need it.
Theres a real good chance that you'll get to put the original parts back on the carb, once the timing thing is worked out.