Have you gone through the distributor? Those through the head distributors run hot, which dries the grease out and makes the shaft sloppy loose and dries out the centrifugal advance. You might can take it apart and clean/lube it. If it's loose, electronic ignition is more forgiving than points.
The flat top distributor caps were used for hood clearance. If that is not an issue, a standard cap and some 90* wires will work.
I suspect that carb has a rubber power valve diaphragm inside that is long rotted away. Did you put a kit in when it was apart?
You've got to get the idle down to the 400-500 range for the mixture screw to have any effect.
Only if the compression is good will it be able to idle down properly. It may improve with some run time if the rings are sticky.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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