I run factory Motorcraft DURASPARK II the hardest part is finding the right BOX. The distributors and everything can be bought at a local autoparts store. Performance and reliabilty is not matched by anyone. If your seriuosly going racing Ford Motorsport sells and upgraded system. I used a DURASPARK System in my B/SA Nercury Comet for 8 years and only thing I did was play with the curves to pick up 100th's of a second.
I can show you posts right on this site of guys with failed MSD boxes ...
Ron
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