NAPA would be the last place I'd be looking for that non original 8N coil.
I see val blt shows a 12 volt coil for the 8N in their 2006 catalog. Might be YT has such a thing.
A 6 volt coil with a resistor the same resistance as the coil primary will work well on 12 volts.
There's another reason for a resistor and fewer primary turns. Not important for a tractor, but for high speed engines, the inductance slows the current rise and the low inductance coil with the current limiting resistor allows a faster current rise and so higher speed engine operation. Some hot 6 volt Chrysler products used a 3 volt coil and a resistor for that reason.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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