I am thinking of buying a 1971 350 custom cab with modified to automatic transmission. Body looks very good. But quite a lot of rust underneath. Mileage looks to be at least 186,000. I would like to know what the values are of a vehicle like this. The upholstery looks to be original but is torn on the side of the drivers side. The rest looks good. Any ideas what a fair price would be. They want $4500.