The information John T gave you is on the right track. However, some of the details (proper lag angle and how to set it) depend on what model magneto as well as the application. I don't believe you have mentioned a model id for the magneto. Most letter series IH tractors call for a 35 degree lag angle. If your timing gear marks are all in line, with the engine at TDC, the magneto drive lugs should be 35 degrees above horizontal oriented at 2 o'clock 8 o'clock. Lag angle setting in the magneto will have an effect on whether you can properly mount it.
This manual covers 3 Wico magnetos, each considerably different from the other. If yours is covered, good. Otherwise it may call for some more digging.
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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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