Six pack help!!

Each outboard carb has idle screws in the lower front base cover with lead plugs.best route is to block off the out board carbs with blocks or something in that nature.get the center carb working with the correct timing then adjust the front carb idle and once that is set move it to the back and move the back to the front and adjust it.Dieing when put in gear usually means a lean condition if it's the carb causing it.