Josiah's advice is good.
My dual Offy came with fuel and linkage kits. These were made for Carter carbs not Rochester carbs but I got over that. One set included a plug for one of the carbs' vacuum "outlet". I plugged the outlet in the carb nearer the firewall and connected the vacuum advance line to the carb nearer the radiator. It works fine.
I do not know what is correct but I have only one carb choked (the one nearer the firewall) and I have no problems starting the engine. This was convenient for connecting the original choke cable.
The throttle cable is connected to the accelerator linkage rod (similar to how it is connected in a one-carb, stock setup). This resulted in not as smooth a movement as in the stock setup but it works OK.
Tim
