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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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