Came across this nice article, published last Saturday. Legend Jim Richards talks about racing the HR 31 GTS-R back in the day, and then gives his impressions after driving it again at Calder Park...
Video embedded of the interview is in the article too, but unfortunately you can't hear the car itself. Still a good read.
http://www.carsales.com.au/news/2012/sports/nissan/skyline/the-skylines-the-limit-33853