Sizing carburetor

I would look more into the avs2 carb but to me it feels at only offering a 650 or 800 is a big difference and they need a middle man as I think that’s where my engine would be the happiest.
street/strip 800
toruring/cruising 650

unless you're looking for 10ths and a few more mph in the 1/4 it's going to run no different on the street between a 650 and 750