40 Pick Up change to 12 V

[32phil]

Looking for some advice on converting a restored 40 Pick Up to 12V
A friend ask me to do it for him as he has no confidence in the 6V system.
I already explained that millions of cars ran 6V successfully for millions of miles over the years..... Crickets......SOOOOO.....
now we're (I'm) exploring the project.
He already has a Powergen alternator that looks like an original generator.
The plan is to swap out the Gen for the Powergen (it's a 1 wire style)
Change all the bulbs to 12V. Replace the coil with a 12V unit and the battery.
I'm not sure about the ignition resistor.
Also the headlight harness has what look some circuit breakers or fuses.
I think the fuses are OK but not sure about the rest.
All wiring etc. is new and in perfect condition
Any help or suggestions would be greatly appreciated.
Thanks All