Cranking speed should not be a problem with a 12V cranking system, but if it does crank slow, points will fire right down to 0 rpm, while a magnetic trigger EI system will not.
A good set of points should produce as good and as well timed spark as an EI system, but in real life, they never seem to do that.
A conversion to magnetic triggered EI almost always produces a stronger and smoother running engine. I suppose most of those old distributors have 50-70 years of acumulated wear in bushings, shafts and point cam, so point dwell and timing are all over the map. The mag trigger EI unit pretty well compensates for that wear.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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