After reading through this thread a few questions. Without any O2 how are you determining that the carbs are rich? Soot on the plug? Do you have the correct heat range plug?If so how do you know if it's at idle or wot. Could be caused by weak spark as well. How does the car perform for power? How about idle quality? Are the seats tight in the carb lids? Have you pulled the lids to verify float level? Have you cleaned the idle air bleeds?
Doug