I thought this would be an easy task until I found that funky old coil is different from every other car I have ever seen. No positive voltage 12V terminal. I guess I can wire in the Pertronix with the existing coil using the IPD diode wires, but I was hoping to also swap in the Bosch blue coil that so many people have recommended. Looks like a pain. I guess I can fab a blanking plate to close off the hole in the firewall left by the old coil, but maybe with a small hole and rubber grommet for the wire between the ignition switch and the coil. That means cutting the armored cable, which is sort of a point of no return as far as keeping it bone stock. I guess I could get some kind of universal aftermarket ignition switch (unless a proper Volvo one for a later version already exists) and keep the old coil with its integral cable and switch intact if one would ever want to reinstall it later. Curious as to what others have done, looking for suggestions. Thanks in advance!