I was going to post about THAT very distributor...
Rick Ehrenberg from Mopar Action magazine has stated many times that he thinks that most of the MP electronic distributors are junk. STOCK ones were great but the reproduction Mopar Performance units are not despite the fact that they look similar from the outside. The problem is that the MP units were essentially a scaled down version of a GM HEI design and R/E claims that not all things scale down properly. The weights in the MP unit are tiny and don't weigh much, leading to unstable timing and spark scatter. He believes that these distributors are "Un-Tuneable".
I've had one for many years. It works but I can attest that the timing does jump around. I can run the engine to any rpm and look at the timing marks with the light and see it dance around. I have to watch it move back and forth and guess what the middle number is and assume that I have it right.
I did not want to use an MSD. The huge control box looks ugly to me. For years, I have considered just getting a stock RB distributor and welding up the slots a bit to narrow the curve. I did just that last Summer for a B series distributor that is going in the 383 in my "Jigsaw" Charger.
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