Dual-point conversion kits were available from the 50s until transistor and electronic ignition conversions became available in the 70s. I have never heard of one for the Buick 8, but since many GM distributors were similar, I guess one could have been usable on the Buick.
What you have might be a rare aftermarket piece - if it still works well, why not keep it? Dual point systems have more dwell than single-point systems, which gives you a better spark, so going to a single-point system would be a step backward. A breakerless system, especially a modern multi-spark system, would be the ideal solution, obviously, but again, if it ain't broke, why fix it?
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