What do I have

I'm lookin at kinda fuzzy pictures, but appear to be 69-72 C body brakes, by the style of spindle.
Sorry about the pictures., but I had a notion something was weird. The guy I got the Duster from was a Chevy guy , so someone dump a bunch of junk on him.
so probably nothing is going to match. Spent about two hours pulling this stuff apart , it was stuck bad. Well it cost me nothing but back to square one.
I'll be needing big bolt upgrade or do I