Car in question is my 73 RR 400 4 speed. It has this type of advance distributor which I have never messed with one like this before. What is the good the bad and everything in-between with this type. Here is a picture and description. This is a NOS vacuum advance unit for the distributor for the years and makes listed below. This is for the electric assisted distributors. This is a original NOS Mopar part in it’s original packaging

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