Tom Abernethy writes:
“I bought it from a photographic stall at Manly Beach near Sydney which had all sorts of repro photos on sale . Spent about another 15 mins trying to find more but that was the only old car pic.
If you search Maroubra on Google there is a good description of the track on Wikipedia.”
See here for more on Maroubra: https://en.wikipedia.org/wiki/Maroubra_Speedway