It looks to me like there is a couple things going on here, the battery is 12v so this is a conversion wiring diagram, distributor is 6volts, coil 12 volts in the diagram. A 12 volt coil actually runs on 8 volts, so you do have to drop your battery voltage down or it will overheat the coil and burn it out. Like mine did. I would go to NAPA and ask for a 12 volt coil with a built in resistor, this will eliminate the resistor in your diagram and make your coil and distributor safe at the higher voltage.
Your other option is to go with a 6 volt battery, then you can drop the resistor from the wiring completely, you will have to make sure you have a 6 volt coil if you do that.
Good luck and keep jeepin
Gun