You shouldnt really have a problem with your a/f being lean with what you did. What makes you think it has a lean problem? Plugs peppered or bright white?? Popping upstairs? Pinging? Those carbs are controlled by a mixtrue control solenoid as long as everything is operating you may even have just a bad o2 sensor.
As Josh said, those carbs control the A/F automatically. I would also say swap the O2 sensor before you start screwing with the carb (which doesn't have jets anyway).
When the key is on you will hear a clicking noise which is the solenoid. Light in color is good as long as they are not bright white. The car should really be scanned to determine that everything is properly operating before you come to any conclusions.
