I've asked your question here, I'll be surprised if you don't get an accurate response.
Personal photos of Australian motor racing '50s to '70s - The AUTOSPORT Bulletin Board
There were some photos of the race on here.
Ken Miles - The AUTOSPORT Bulletin Board
Just a warning: Opening any of these threads may see you sitting at your computer for the next two weeks!
Here is your answer:
BOWDEN FAMILY COBRA DAY AT LAKESIDE. | BOWDEN'S OWN