The Bike has some circuitry to avoid you pulling off with the side stand down, switches in clutch, sidestand and neutral are in the circuit. Sounds like that is why she dies when you pull the clutch in.
Carbs have three pipe connections each, fuel in, float chamber vent out and vacuum port. Float chamber vents are in between carbs, teed together and the long hose from the t tucked into a hole on the right ear. Fuel in is obvious, the bigger black plastic pipes. Carb vacuum comes from the side of the carb close to the inlet, left goes to operate the fuel valve, right goes to the valve controlling air flow to the reed valves that are supposed to stop popping on deceleration.
'99 Vulcan "Victoria"