That name sounds familiar Jac, it is certainly not an MG. If its a Commodore, then it could be either Allan George or Peter Woods. I do not remember Woods Commodore's colour, Jac may know, it was quite new at that stage and Woods won the title. There are very few cars I remember, Chamberlain, Jago and Woods stand out, there were an A9X and SLR 5000, Tony Cardwell should have been there in a Pontiac TransAm but I don't remember him being there, as Dave Sangster in his Monaro was another who was definitely there.
The NZMN article able the champs says.
Peter Woods Commodore won the title from Doug Smith Monza, Dave Sangster Monaro and Lance Jennings Torana A9X. Woods won race 1 from Evan Jeffs Camaro and Ron Taylor Mustang.
race 2 Jennings from Woods and Cardwell Pontiac 3rd
race 3 Jennings, Woods and Sangster.
This shot is from the Woodford Glen Saloon car series it shows Chamberlain and Sangster, Smith and Jennings and Warwick Leech and Tony Cardwell. Sorry about the quality of the shot, but looking at the shapes I wonder if the second car is Lance Jennings' Torana