Gosh, this all takes me back to tuning the early 2000 Bonnevilles with twin CV Carbs!!
If you do anything to increase air in you have to be certain that air gets out and the right amount of fuel is mixed at all throttle openings. It isn't simple.....
It is easy to get it wrong, too much fuel just wastes it, to little can result in damaged exhaust valves.
I wrote a guide on the subject. It applies to all CV "Stromburg" type CV Carbs, but is good background anyway.
You can get it here:
Jenks Bolts Guide Hope it helps....
