The green stuff (verdigris) comes from water left in the carb. Water could be from condensation, or from ethanol in the gas. (The ethanol in regular gas and E85 will always have a bit of water, and depending on how the fuel is stored it could pick up a lot of water.)
There are a lot of things that can cause dieseling. Make sure the idle mixture screw is working (which means the idle circuit is OK). It may be that the idle stop has to be screwed way in to make up for a plugged idle circuit.
Make sure all four cylinders are hitting by pulling the plug wires one at a time. These engines run very smooth, and you can have one or even two missing cylinders and it will sound like it's running fine.
If everything seems to check out, it may have carbon deposits in the combusion chambers. I've had some success with using snake oil gas treatments that supposedly remove carbon deposits. I'm not sure if they really work or if it's in my head, though.
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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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