Points and condensers don't care what voltage the ignition system runs, but the choice of coils is vitally important. You'll need to run a "12 volt- - - -non-resistance" coil, and a ceramic ballast resistor to drop the voltage to the coil to approximately 9 volts during normal running. You will need to swap the foot start switch on the starter for one for a 1955-up 12 volt starter, the one with a small side terminal on it. Rock Auto has that switch in stock. Run a wire from the side of the starter switch to the + terminal of the coil to bypass the resistor during starting and allow full battery voltage to be applied to the coil. Your 6V 216 starter will work fine on 12 volts- - - - -just limit cranking time to 15 seconds or so. A well-tuned engine with a good fuel pump and carburetor will start with 5 seconds or less of cranking (sometimes a lot less)!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!