I emailed the guy to see what has been done to the engine and if he can give me more info on the trans, rear end, and what other parts that come with it for curiosities sake.
You're looking at $1,000 for the headers/intake/carb/ dizzy.
Is the rest of the package worth $2,000?
If the 8 3/4 is posi and ready to run as is there's another $800-$1,000 .
Is a 383 long block of unknown origin and 727 worth another $1,000? If the engine is solid I think it could be a nice deal for $2,500 to $2,800. Lots of unknowns and "ifs".
I would find out a bit more about the engine internals and consider offering $2,500 for the lot and let it unfold from there.