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Isn't that a drum brake master cylinder?

I could be wrong, but ....
1970 power drum brakes e-bodies had black painted boosters and "natural" master cylinders.
The drum brake master cylinder should have the bolt on cap NOT the bail-wire captured cap.



the car came stock with drums in the rear and disc's in the front



You have the wrong master cylinder. You need one for disc brakes, casting number should be 2229171.

Courtesy of Mastershake340.