I would look into fuel delivery problems, could be carb/float issue, weak fuel pump, line restriction, insufficient tank vent (vent line clogged or vented cap issue).
Fouling plugs and fuel octane are not related. High octane fuel burns slower, to resist knock or pinging, that's all it does. Most gasoline has ethanol now, if not added for a specific purpose, it is almost exclusively added to increase octane, the higher the octane equals more ethanol added and this doesn't have to be disclosed.
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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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