Pertronix II users

I run stock coils and the the ballast with the Pertronix II units in stock distributors on 5 cars with thousands of combined miles. I was power electronics engineer for my career and I have alway thought the stresses on that module with the low impedance coils was way to high for a dependable street engine. Drag strip runs only fine. You are slamming that module with 13v/.6 ohms = over 21A of current for every plug fire. I have 13v/(1.5 ohm + 1.5 ohm) = 4.3A of current. There is zero reason to make 45000 volts when a plug fires at about 18000 and once it fires takes much less than that to continue the flame. That 45000V volt stuff it only for advertising.