The so-called "lead" additives contain no lead. Any tractor that was broken in on leaded fuel will have enough lead embedded in its valve seats to prevent wear.
Bear in mind that your Farmall was designed to run on pretty crappy fuel. The only reason to run higher octane than regular gas would be if someone installed high-compression pistons at some point in time. In that case, you would hear pinging under load. No pinging, no need use premium gas.
As for ethanol, it's a fact of life that almost all gasoline has added ethanol, so there's no point in worrying about something over which you have no control. I would not rely on any fuel supplier's claim that their fuel is ethanol-free without testing it myself.
In other words, buy regular gas from a supplier you trust, and fuggetaboutit.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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