How much is it worth

I know I havent posted on here for a while been really busy. But anyway I was just wondering how much a 78 280z goes for I am trying to sell mine it still runs like a champ but I dont think it will pass smog over here. If anyone has ever read any of my posts you would know what it looks like and how much I put into the engine alone. There is also no rust except the part under the rear hatch which is about 4" of rust which can be fixed easily.