What is this?

I attached some pictures showing more of the brake system. I already started taking some of it apart. The car has drums on all 4 corners so I assume that means that that piece is a distribution block, not proportioning valve. According to the "Mopar Kit with Ford Master Cylinder" picture Professor Fate posted, it seems like this car has a ford master cylinder. Which would make sense because Fate also said that the distribution block looks like one from a ford. Looks like the brake booster is oem mopar. Should I look into changing both the master cylinder and the distribution block back to mopar? Is there a different direction I should go with this? Thanks everyone!

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