Need Help figuring out how much car is worth
 

My son's father willed him a 1990 Porsche Carrera 2 soft-top. Supposedly there is something about it that makes it different than other porsches' made that year, something about the headlights are different. It is in very good shape, white with a black convertible roof. It had an oil leak, but has been fixed (had to remove the motor and rebuild what ever was leaking) It was in one minor fender bender (had to replace driver side mirror). We want to sell it. Can anyone tell me how much I should ask?