Install one at a time on a stock intake and get each carburetor running as best as you can. Then when you go to two, half the work is all ready done. The jetting will be very close with one or two. The engineers design the carb to use X amount of fuel with X amount of air for a optimal air to fuel ratio. The carb determines this ratio so it doesn't matter what engine its on or how many you use. Set the throttle openings with a Uni-sinc then adjust the linkage just as stated above. The most you have to adjust is the idle mixtures and maybe the choke. Joe