Brake question on 72 dart

The brakes were not working when bought car. It is a drum brake car that I'm going to change to front disc, rear drum. This is what that was on car as bought. Not sure it was originally a power drum car but am planning on leaving power disc. I think this original setup was not what came with car. Now the question, what power booster do you think would work with this setup? I am going with new lines and proportioning valve.

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