Been a year and a half since I did it, but I wanted to give it time to see if it was reliable and workable. I did the GM HEI module conversion on my ignition system on the Capri using a 4 pin module and Ford Duraspark distributor. Wiring was very simple as per the various diagrams found online. I was using an MSD ignition system and I was constantly fighting hard starting and predetonation issues- even on premium fuel. It was also a mass of wiring and I had to use one of the tach adapters to get everything working. The first tach adapter box caught fire too, which sorta killed my faith in MSD products' reliability. The GM HEI module needs no tach adapter and replacements in the event of a failure are cheap and widely available. I also bought a heat sink and module bracket for the HEI module and cut them so I could mount the module off to the side of the TFI coil bracket. The module gets super hot, so air flow and a heat sink are a mandatory for long life. I bought corresponding wiring harness connectors for the Ford harnesses so I could do a fairly clean install. Not only does the engine start significantly easier, but I can run more base timing without pinging- even on ethanol free 90 octane fuel instead of 93 premium.
If you're tired of going through Duraspark boxes and/or you want a higher energy ignition system on your Duraspark vehicle, this is a super simple system to install with plenty of good info out there. Not sure if others have done it, but I can recommend it!
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