Today's 87 octane is the equivilent of the 1950s 93-94 octane (measurement standard has changed). If you're running 10% ethanol you probably have at least 89 octane or what would have been 95 octane when the tractor came out.
Octane is the ability to resist combustion under conpression. The higher the compression ratio the higher your octane needs to be to take advantage of the engine's potential power. Until you get over 8.5 compression ratio today's 87 octane is all you need.
The 1940 M's "High Compression" engine only needed 71 octane to operate efficiently.
A 450 Farmall runs at 7:1 compression (or less can't find the numbers right now) - your octane level isn't causing your problems.
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