You need something to make 13.5-14.5 volts to charge the battery. The standard coil is fine, just add a resistor. If you have any light bulbs anywhere, they will also need to be changed. That's about it.
When you add a resistor, you can do it several different ways. Many later Ford tractors with 12 volt systems use heat-reactive resistors that eliminate the need for any bypass system. They automatically give full voltage at cranking, and taper back once warmed up. Or just use a conventional ballast resistor and relay with bypass.
Using what many call a "6 volt" coil with a resistor will give you better cold starting potential, then using a non-resistor type coil that many call "12 volt."
The vast majority of cars, trucks, and tractors with breaker-point igntions, used the same coils on 6 volt and 12 volt systems.
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