At the same Bay Park event that Joe Chamberlain raced at in late 1970, the organisers also brought out two Australian Camaro's to race. Now while New Zealand had a 5,500cc engine limit, Australia had a 7,000cc engine limit at this time. Allan's was fitted with a 396ci big block, Thomson's a 427ci big block. Straight line speed wasn't a problem, but slowing these things down on the tight Bay Park layout proved challenging. Look at the understeer Allan is fighting.
I forgot to mention, New Zealand had a wheel width limit of 12" at this time, and this would go out to 14" within two years, while Australia had a 10" wheel width limit.
The car in front is Terry Allan's '67, which was the first Camaro to race in Australia. The second car is that of Bryan Thomson. Both cars ran quad-Webers, which was also common down this part of the world.
Note that the Thomson car is right hand drive.