If you're using the linkage that comes with the Offenhauser intake,it's very crude,but can be made to work ok.Adjustments to the carbs should be made with the throttle linkage disconnected between the carbs.You didn't mention the type of carburetors ,but are they matched? same part numbers?Even Rochester B's have a multitude of variations in air bleeds,idle transition, power valve and main jets.
I had dual Rottenchesters on my 37, both carbs were matching mid 50's models,the larger size.The carbureted great with no changes at all ,used the stock #57 jets.
I hooked up the choke on the rear carb, the cable wouldn't reach the front one
But the choke wasn't needed ,just pumped the gas pedal a few times, started instantly,a little foot feathering on the gas got it going until a few miles warmed the engine.
Multiple carb adjusting is easy using a carb Sync tool or simply a large rubber hose.With the hose to your ear and on the carb opening,adjust the idle speed screws so both carbs make the same sucking noise.Then adjust the idle mixture screws for the best idle quality. You may have to repeat the procedure a few times to get the idle speed and mixture correct.Then hook up the linkage, checking for proper operation ,both open at full throttle, both open together off idle, both close against the idle speed screws.
