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I installed a used HEI distributor on the engine I'm building, I don't know its condition and I wanted to replace the coil and anything else that goes bad electrically. My question is which parts other than the coil, burn out on these ignitions? Thanks
 

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There's a pick-up coil mounted around the shaft that sometimes goes bad. You have to take the distributor apart to replace it by driving out the pin in the gear. Good time to do it is now.
The other part that goes bad is the electronic module. My opinion, if it is a GM module I would leave it in and not replace it. AutoZone can test the module for you for free, but I've had intermittent ones pass. I have had rotten luck with the new overseas made replacement modules. None have lasted. I always use GM modules even if they are used.
The module must be installed on an even layer of fresh dielectric grease or it will fail.
 
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