The 112's were introduced for the high revving Z-28's and Corvettes of the day, originally. At least that's what I read 40-odd years ago. I use NOS 106's in my GTO's with no issue, and also in my '61 Corvette, which has been retrofitted to a '69 distributor for its vacuum advance. No points bounce well past 6000 RPM, so a great choice for the Pontiacs which rev lower in general. The 112 has a much stiffer spring than the 106, at least all of mine do. Currently have about 10 spare sets that are over 30 years old and in the queue to be used as needed.
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Jeff 
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