rust in my msd distributor

any body ever had this problem , I am changing my motor in my 65 barracuda and its tight so we pulled the didtributor out and found this , but car runs fine yet. try to get a good picture I get this . its rusted on the paddle wheel inside and above on the top of the pickup ciol pick-up ,any 1 else seen of have this problem and how far did it get or how did you rid this problem sorry I didn't have better pics tonight I will have to get some different 1ns soon .