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I believe that WFBowen has it correct.
I talked with one of my old friends, that was factory trained, and has been building Porsche engines since the early 60's both racing and street. Not discounting the RS0012 (which will not working in all 912 engines) the 031 is considered the best all around distributors for this engine. My friend has discussed this with other Porsche engines builder over the years. The 022 was the first dist. for the 65-67 912 engine and if you want to keep it original. But for optional performance the 031 is a little better. There are three types of 031's. You want the types 1 or 2. The type 3 is poorly made and not made in Germany.
Don Marks, before he passed away, optimized my 031's (I have two of them) for my engine with the Webers and cam combo. The car runs about as perfect as you can get with the 912 engine. The Weber's are also optimized for my engine.
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