I don't see any real advantage to a wide gap. The wider the gap, the more likely the spark is to go where it's not supposed to.
Wide gaps were designed to help fire the emission control lean mixtures. It proved to be troublesome with the cap, rotor, wires type ignition. Now they use individual coils, one per cylinder.
But for your application, a carburated, low compression, low speed engine, wide gaps will be of little advantage.
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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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