The best carb is a 16mm Walbro WT-603 or copy or 813 w/ accell pump. Or for Nastier engines a HDA48D 19mm , no return line, or HDA223B 19mm purge carb. No turn off valves, no jets, no floats & bowls to mess with. Just the idle screw and a high on low jet screw, and it pumps gas out of your tank, not gravity fed like Cags and C1s. On the 19mm had to hog out the 16mm Cag manifold to match the carb.
The first 2 photos is an 19mm HDA48D on 4 reed ADA Racing box manifold, the last 2 or a HDA223B 19mm on a modded Cag, MTA2 alum manifold.