iowaboy........many "bubba" conversions use an el-cheapo 12-to-6V converting resistor in series (like flashlite batterys) with the MANDATORY "infamous ballast resistor" on the back side of yer instrument panel underneath the ammeter. Remember, the 8N came from the factory 6-volt positive (+) ground and alternators must have the MANDATORY 12V-negative (-) ground ...or... you will let the smoke out of the alternator wires.
I recommend the modern 12V squarecan ignition coil which still needs the "infamous ballast resistor. Unfortunately, they cost $$$ while yer 12-to-6V converting resistor to use with the original 6-volt squarecan coil is CHEAP. Still needs the MANDATORY ballast resistor. ........Dell, a 12V advocate for the right reasons