Great pics John, thanks for sharing 'em.
Unfortunately (for us, I suppose) only the 48-FJ club(s) are invited to this day, and TTBOMK this is because the '48 was a predominantly US-designed vehicle built in Australia, like many of the pre-48 cars.
On that basis you could mount an argument that the HB Torana (based on Vauxhall Viva), the VB Commodore (based on Opel V series) and the Calibra should also be eligible
It's always a great display, with a huge variety of vehicles, which just showcases the long history and huge number of marques under the GM banner.
cheers
RET