Killed Two Distributors and Don't Know Why!

You are going to have to provide some "real" details about your ignition.....are you talking about a breakerless/ magnetic firing a Mopar box or just what?

IT IS possible that (if that is the case) that the Mopar box has some sort of electrical problem that is causing current flow through the magnetic pickup and damaging it.

If this is a "ready to run" or something similar, could be mismatch of coil / ballast or even a coil going bad. What is the history of it?