how much for a 1971 ninety eight olds

depends on where you live and what size the engine is, but I will go out on a limb ana say between 3500-5000 more if it is a convertible, these cars are not as popular as the cutlass. Some of those come with 455's so with the cost of gas going through the roof, SOME buyers are getting picky, but if you are looking at a car like this, gas is not something that you really think about. rough guess without seeing the car. Best of luck, Hope this helps.