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Here's how I would do it, using "Dell's Trick Current Limiting Resistor", two 1-Ohm, 10 Watt power resistors connected in parallel, to make a 1/2 Ohm, 20-Watt resistor. 
In most cases, the aftermarket "12-Volt" coils do not have enough primary resistance when used with a modern alternator charging system that puts out 14.5 Volts+, and will overheat without at least SOME resistance ahead of them. Some folks have had good luck keeping the OEM ballast resistor in the circuit instead of the 1/2 Ohm resistor.
The OEM ballast resistor has a resistance of well under an Ohm when cold, and it's resistance quickly rises to nearly 2 Ohms, as it heats up from the current flowing through it, in normal operation, whereas "Dell's Trick Resistor" has a more or less constant value of .5 Ohm. So, whatever you do, keep at least a low-value resistor ahead of the coil. If too much resistance is used ahead of the coil, spark will be weak, but no damage will be done. With NO resistance, the coil will run hotter than it needs too, leading to premature failure, and the breaker points will be carrying more current than they need too, shortening their life.
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