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Hi,
I have installed a old MP race ditributor part 4120942, think its from the early seventies. It have tach drive.

It seems to be looked, its have no mechanical advance. I have a new MP billet race distributor on my other car and that one you could adjust the mechanical advance with changing the slots (bigger or smaller) and lock it with a screw.
Havent disassembled the old race distributor yet but do anyone know how to adjust the mechanical advance, is it the same as the new billet race distributors (mopar performance)? Just change the size of the slots. I think its a kit for the right size, advance curve kit...

Thanks folks,

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If it is one of the early tach. drive mopar distributors, iron case, not aluminum, it may have had the advance weights welded to make the distributor have no advance so they could use it on a crank trigger ignition. I have two of those now, they do not have the top plate in them with the pickup or reluctor wheel on the top shaft , you can see where they are welded up