If you can wiggle the distributor shaft by hadn, the bushings should be replaced. If, in using a timing light, you see that the timing jumps around at all, the bushings need replacing.
You'll probably have to drive a pin out in order to disassemble, but once apart, take the body and the shaft to the supply house, and they will measure and sell you bushings that fit. Seriously, put the housing in the oven and the bushings in the freezer. Install them quickly and they will slide in very easily. Much more difficult if they are both at room temp.
Clean everything up and put a little grease on the stuff that moves.
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'83 SC
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