I think I know which one you're referring to. It's a casting (109) which is the same as a 86-87 turbo block. Front of the block would have to have a hole drilled for the turbo oil return. Other than that no differences. The block would probably not have the correct internals though such as a rolled fillet crank. If it's a reasonably price it would be worth picking up. Standard bore blocks are worth $300-400.