It's not a JDM GT. He's dreaming if he thinks it's worth that much. I think the mileage is BS, unless he's stating the mileage since the engine was rebuilt, or the car has been off the road for many, many years (probably due to an accident) and he's rebuilt it over time.
To me, it screams "danger Will Robertson, Danger". It appears suspect to me. If he get's the money he's asking, then good for him and sucko to whoever is willing to fork out that much dosh.