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To carry a spare module is always a good idea. I have found this to be true since Pontiac started coming out with Transistorized Ignitions in the early 60s, which moved on to Corvettes. I had one fail, luckily it was in my driveway. When GM came out with HEI in the mid 70s, their internal module was also problematic. I looked into converting my 60s cars with Pertronix, but after reading the reviews, decided to leave the points alone. Tri-Spark is supposed to be the best, so I will just take this failure in stride.