You've got a slightly bent distributor shaft. Unless it's changing the timing (ball/pointer jumping around) when you check it with a timing light, don't worry about it. The fix is to dismantle the distributor, set the shaft up in a lathe or a drill press, and straighten it, using a dial indicator. Big job, and not really necessary.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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