I dont know anything about vulcans . what is it you want ideally ? like weight , hp , 2 stroke 4 stroke .
mikuni vm carbs are all over the place , they are conventional , well built , round slide , carbs .
Nobody seems to know how to tune cv carbs including the factories .
Lectron carbs are my preference they are about as simple as a carb can possibly be and they will roundly whip any other carb that I am aware of including the current keihin pwk. Lectrons were used on pro stock bikes until they went to efi so it's a buyers market now .