I have never seen a rebuild kit for a distributor. You can buy most of the parts to do it yourself. The major wear places are the centrifugal advance parts, the vacuum advance can and the shaft and bushings. The advance stuff can be gotten from parts stores or speed shops easily. The bushings will be a bit tougher and the shaft (if needed) will be more spendy. It may make more sense to buy a rebuilt unit, as the rebuilder can probably do the job for le$$ than you can.
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