How much would a 1955 Buick cost?

My father has a 1955 Buick parked out in the back yard, as far as I know it needs a new carborator and paint job. Around how much could he get for it?|||lots of variables. 2 door, 4 door? hugh value range depending on doors. Rust? it would be worth from 500.00 to about 5000.00