Recheck the idle pick up tubes. Under the venturi assembly, the small tubes that hang down in the well. Clean them with a tiny stiff wire, like a wire from a wire brush. Be sure the wells are clean.
There are also pressed in idle air bleed vents in the top of the venturi assembly, be sure they are both in there and clean. Some just had holes with no pressed in vents, just be sure both are the same.
Is this on a V8 or V6 engine? It likely has a dual plane intake. A vacuum leak on one side of the intake can make the carb difficult to adjust. Also be sure the engine is idled down to a slow idle when adjusting the idle mix. If you can see gas being drawn through the venturi, it is idling too fast to adjust.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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