The blue in the exhaust is from burning oil. While a properly set carburetor will help keep the plugs from sooting up, the only permanent solution is to find/correct the cause of the oil burning.
Depending on how badly the engine is burning oil Champion D21 or D23 plugs (or another other mfr’s heat range equivalent…) may be hot enough to keep them from fouling.
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Incidentally you can do a quick “field rebuild” on the carburetor without taking it off the engine. Simply disconnect the air cleaner hose and choke rod, then remove the 4 screws holding the throttle body to the bowl assembly and drop the bowl.
Frequently it’s only the bowl that accumulates junk/needs cleaning. Unless the throttle body is plugged up really bad it can be cleaned simply by taking out the idle mixture screw and blowing the passage out with compressed air.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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