So you're standing at the parts counter.....

One of the problems with swapping parts around on an ignition system is that what you need to know is not easily measured. Folks talk about voltages all the time because that can be easily measured. What is really important is the current the ignition module has to switch. This is not easily measured, as it is a pulsed current and varies with time. (Voltage measurements are also time varying, but that is another subject)

If you keep the total resistance of the coil and the points the same, you are probably ok. From post #22 the lowest numbers added together and the highest added together are about 1.9 to 2.4 ohms. So, if your coil and ballast resistor of choice add up to something between 1.9 and 2.4 ohms, you are probably safe.

This is oversimplified, but should keep you in safe operating territory.