It should run on resistor wires IF they are good. Cheap carbon wires don't last long. Good spiral core wires are the best choice.
Check the spark quality at the plug end of each wire when it is warmed up and causing the problem. With it running pull one wire at a time, it should give at least a 1/4 inch spark to ground.
Check the distributor shaft for side play. The points will not stay set if there is wear.
The coil could be failing or the wrong coil or coil/resistor. When it is up to temp, feel the coil, it should not be too hot to hold, or considerably hotter than the surrounding components.
There could also be a fuel delivery problem. Try loosening the gas cap. Do a fuel test at the carb. Remove the drain plug from the carb bowl, catch the flow in a clean glass. It should flow a stream, not slow to a drip or stop flowing. Look at the fuel caught, check for dirt, rust, water. Whatever is in the glass is in the tank and carb. Contamination will be an ongoing problem until it is cleaned up.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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