How much should I ask for on my 1970 Arctic Cat Panther 440?

I am getting ready to sell my 1970 Arctic Cat Panther with a Kawasaki 440 Motor. It turns over and has spark, The only problem is that it had rust in the gas tank as well as flakes in the carb. I just got the carb back and had a carb kit put in it. I don't know a lot on old sleds, and am wondering how much I should be able to get out of it.