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my old MP distributor not have mech advance setting and is very hackneyed.
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You lost me here and with your goals. Are you looking for an easily adjustable mechanical advance limiter? If so, that's easy to fix if you're willing to take it apart. It can be limited by welding or brazing the slot, installing a preslotted plate (such as sold by FBO).

Yes some aftermarket distributors make adjusting the advance limit easier. So that is an option too.

The two distributors you picture are rather different. One has no vacuum advance and will require the later style spark plug wires, and your going to have to add a connector for the signal/trigger wires. The other has a vacuum advance and requires nothing else to hook up to your existing system.

As far as the ECU goes, there were several different Chrome boxes made over the years. Might be useful to see if there is any number on it and then ask if someone can check the Mopar Engine Book. It's probably fine for street use. Hot rod parts are not always made better than stock. Sometimes they are better for racing, sometimes they are better on the street too, sometimes they are neither.