Bogged down While In Gear And Sputtered During Acceleration

If the throttle plates are open too far at idle via the idle speed screw (to compensate for a big cam, or not enough initial timing) the engine will pull fuel through the main venturies and the idle mixture screws will become ineffective. It is possible that you are right on the edge of this and one barrel is pulling fuel through the main venturi. You can see this by looking down the primaries with a good light at the boosters while the engine is idling.