If this is a "P" case then $1,500 to $2,000 to a some doctor or banker restoring an early C! Corvette. If it is a standard case with an aftermarket posi it would depend upon the condition because the aftermarket posi's can not be rebuilt with new clutches you have to buy another posi to replace it.
The problem with this rear end is that the rear end was designed in 1943 to be placed behind a 216 cube six cylinder. It will not handle a lot of torque, because it was never designed to handle it.
It has a P with a date code of D284, so I think it is what they call the thicker case, all original I think, except maybe the bearings. Is there a way to identify original bearing.
So what you are saying is no one would want this thing except someone with a early corvette.