7.25 rear woes....

My ignorance is also a crutch.

Saw this just now
[FOR SALE] - 1969 A Body 8 3/4 rear end

Does this discription mean i would need to buy the “chunk” or “pumpkin” or center piece or whatever and can i put disk brakes on it?

Is this the kind of thing i should keep my eye out for or a complete one?