Ok, thanks.
What I want to know for sure is if I can I can choose between two different methods to get 3 ohms so that the points will not get damaged. Are you saying that I should stick to alternative 2?
Alt. 1: skip the ballast resistor and instead buy a coil with an internal resistance of 1.4 instead of 0.7. The effect is the same along with the resistance wire, ie. total of 3 ohms. Also, I know what I get because the ballast resistor increases from 0.7 to 1.5 when it gets hot, which I think could be a problem during extreme summer heat.
Alt. 2: keep the 0.7
ignition coil, 0.8 ballast resistor and 1.5 resistance wire that together will result in 3 ohms.