1968 barracuda 383 s 4 speed value

ha guys i have a chance to buy a matching numbers 68 barracuda 383 furmula s 383 4 speed. The car needs minor body work and paint. The car has its window sticker and origanal spare tire and jack. the car runs rough but is complete. The guy is firm at 18000. The car is in canada but is a california car . am i getting a deal? thanks