For time considerations, I will address only your question regarding Nebraska tests.
The IH Cub and the AC G used small 4 cylinder flathead engines of about 61 or 62 CI. I believe that the MH Pony used the same Continental engine as did the G.
Many other small tractors used small 4 cylinder flathead engines as well, e.g., Avery, etc.
FWIW, the fundamental reason that flathead engines were replaced with I head engines in the automotive market was to allow increased HP due to increased CR. Yes, the I head design allowed other improvements but the improved combustion chamber design of OHV engines allowing much increased CR was the fundamental reason.
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