First, I love the old Stinson. Second, you are going to find the 180 is a really nice bird. And third, I have no idea what a GL-82 is, but it will not increase the value of your aircraft quite as much as a GL-82 is worth used.
If I were ever to get another Stinson, it would have to come with a Lycoming 0-360, constant speed prop, Clevelands, and no other mods other than a decent instrument panel. Even those are $30,000 airplanes.