I posted a video of the Prince R380 breaking the landspeed record at the Yatabe test course over three years ago and now IKnowSkyline posted up another one of the Nissan R380A-II:
Not only did Nissan use this Prince developed race monster:
…they also used the Prince Gloria A30 as the safety car on the Yatabe track (it can be seen at 3:12).
And after 1 hour and 17 minutes it reaches it goal of 320 kilometers with an average speed of 250 km/h!
Direct link to video: NISSAN R380 「記録への挑戦」