What should I pay for a 1928 Tudor

[Gwill65074]

I am looking at a 1928 Tudor that is not running, although the current owner says the previous owner rebuilt it, says he can look in the spark plug hole and see shiny pistons. When I look at it the engine is pretty dirty for something that someone rebuilt and never started. Needs wiring, fuel line, glass, top, and interior. It's been painted but not buffed out nor has the visor, light bar and headlights and rear bumpers been installed, but he has them. The body looks straight. I think it would be a nice car, but I think he is out of line on the price. Sure would like some input on this please. Glen