The stock breaker point and coil system is more than adequate for the ignition needs of a Farmall C. Were it mine I'd leave the ignition "as is" and save your money.
For a 12 volt conversion, again the stock 6 volt system maintained good condition is entirely adequate for a Farmall C.
However if you decide to go to a 12 volt alternator I'd recommend a Delco 12SI alternator. It was used in most GM vehicles from the early 70's through late 80's. It's plentiful, cheap and reliable and the most commonly used alternator conversion.
All existing electrical parts (light switch, ammeter, wiring harness, starter, etc) will work fine on 12 volts. The only exceptions are the light bulbs (you must change to 12 volt lamps) and the coil. You will need is to either add a ballast resistor ahead of the existing coil, or to swap the stock coil with a self-ballasted "12 volt" coil.
Wiring instructions for a Delco 12SI alternator can be found at the link.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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