Super Six Idle Issues... Bit 'O' Help Please!

I had the same problem on my Super Six set-up one fine day. After it had performed well when I got it together. I have two carbs that I can go back and forth with. I noticed also that the damned thing felt like it had a vacuum leak. Traced it down to a loose throttle bushings, after rebushing with some brass inserts, this tightened up the carb throttle shaft, no more vacuum leak. After spraying different spots on carb with WD-40 I noticed it ran better spraying base of carb, replaced base gasket, no luck, then the shaft bushings. bingo