Reading about your problem several things come to mind;
-If as you say the tractor has been converted to 12 volt and it has a ballast resistor it is possible you are getting spark while cranking but due to either a wiring issue or a failed ballast resistor you will have no spark once you release the start button.
-Has anything else been checked? compression, valve adjustment etc.
-You say you have a good spark, was that checked on one cylinder or all cylinders?
-Could firing order be mixed up?
-Moisture under distributor cap?
-One or more old wires shorting out?
-Badly restricted air filter?
-Regarding your carburetor, if you are adamant the carb is causing the problem then remove the air intake hose from the carb and squirt a teaspoon of gas directly into it and try starting, if it catches and runs good for a few seconds then you have confirmed you have a fuel problem. If you are getting a good constant flow when the drain plug is removed then it is time for a proper carb dismantle and cleaning.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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