To clarify. The 12V coils that I purchased from my local NAPA are designed for direct 12 v input w/o a resistor. I installed these 6 yrs ago and have not had any type of problem with the coils (in 36 plymouth and 52 1ton) or the points in either vehicle. I did however install a ballast resistor on the heater motors as they remain 6 volt. The fuel guage in the 52 is not hooked up as the sending unit is bad, but the one in the 36 will have an inline (not ballast) resistor installed as soon as I find a working guage. I bypassed the ampmeter in both vehicles as they are a potential source for failure if accessories are added. I installed a voltmeter in both vehicles, fused the brake and marker light circuits as well as the heater motors and changed all the bulbs. I'm happy with the conversion to the internally regulated Delco alternators.
As far as the key switch goes, mine is the original 3 post. The accessory post is just a post to connect accessories to, but the switch is basically an on/off switch with only 2 positions-no accessory position. Mike