Fouling could have a simpler answer than might first come to mind. It may not be plugs, or the electrical system at all.
Have you checked the valve guides in the head?
I have a '40 H that I could not keep from fouling the number 2 cylinder plug: tried plugs, cables, points, and it still fouled. Sounded like a John Deere when it ran. Compression was never a problem, and I was ready to use her as a 'moble parts supply' for another tractor.
On the advice of one older and wiser than I (my father), I replaced the head with one from a different engine, and low and behold, it runs as smooth as a sewing machine, with nice clean plugs.
Turns out the valve guides were worn on the old head, and were letting oil leak in to the cylinder, resulting in fouled plugs. I'm not saying thats you're problem, but it sounds suspiciously close to it.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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