Maybe someone can help me with valuing an 89 Turbo T/A. A co-worker has one it has been sitting for at least 5 years if not longer. I'm not sure of the mileage, it doesn't run and also has a problem in the transmission. The body is in fair condition. Interior is ok. I want to make the guy an offer but I'm not sure what these cars are worth or how to value one. Any help would be appriciated.