[Berg]

Hey guys, I'm jumping in a little late on this one but wow, why can't I find stuff like that? As far as what is it worth? You can tell a lot about a factory stamped block by reading a bunch of fakes. In 1970 the factory broached the decks with a series of cutting blocks that dragged across the decks in a straight line. I'm going to say 99% of machine shops out there today would not take the time to duplicate the factory broach marks. Most aftermarket deck jobs will be done with a circular machine so it would have a semi-circular pattern. The fact that it has been sitting and has a lot of rust would be a death sentence for a regular Malibu but the fact that it is an SS would leave a large market for it. It might not be an LS6 or an L78 but it still has value, especially if the rest of the driveline is original, or you at least have the original housings to put it back together with. I'm not sure where you are but I would bet it would cost about $1,500 to have the car shipped a good distance across the states. With that being said, So long as the car can be fixed. I'd say in my area of NY a car in about the condition i'd estimate it as would go for about $6,500 asking price. What it would realistically end up selling for would probably be around $4,800-$5,000 providing you had some sort of title or transferable registration for it.
I'd question if the car is stolen or not just for the fact that it was "found" in a shed and stashed... It is always a possibility. Most police stations will run the VIN and tell you it is clean (or not) to help you out.