How much is an 86 olds 442 worth?

Me and 2 other guys want to buy it the guy wants 1500. From what ive seen it is in great shape and im told it runs and drives (ill see for myself before i buy it). I live right on a Freeway and i want to try and flip it and double my money on it. I live in Michigan right outside of Lansing (Big Olds town) if its in good shape. what is a reasonable price to put on it?