Msd distributor may fit better and look more period than a traditional GM HEI as there is a significant physical difference. Not sure a traditional HEI fits anyways.
Pertronix just eliminates the points and condensor with possibly more consistent spark timing. Does nothing for increasing spark or anything else.
When they came out many long years ago I ran them in a couple of vehicles only because an HEI wouldn't fit or didn't want to modify aything.
Your current setup is good enough to get you rolling, and costs you nothing. You can always upgrade distributor at any point just as easy as now.
Hell just a better coil can wake an engine up some.
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