Some ignition questions

macadoo1961 said

I found there is some play in the shaft which I'm sure could cause issues with the reluctor.....is any play here normal? And is it easily fixed? Car runs good pulls hard to 5500 rpm no problem when it runs.....idles a little rougher at times.....could the rougher idle be a symptom of the play in the shaft?
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Look in the service manuals. You can download them free at MyMopar. You need to download some later ones to get the electronic ignition, 73 is good year

There should be a procedure in there to check distributor shaft play. It is not very much. I have to say that if you can visibly move it, it's probably worn.

So far as coils, there is recommendations for coils for HEI "around the net" but on mine I use a stock factory coil, with HEI, and no resistor. It has held up just fine.