This was the Holden HQ Monaro circa 1972 a really hairy chested machine from the era when petrol was cheap and anyone could afford a 350 cubic inch ( 5.7 litre ) V8. They made a great rumbling note which sadly went when all the anti pollution gear went on later generations.
I don't know if this was a bona fide colour for the Monaro but that green was on a V8 Holden Sandman I owned in the late 70's - happy days !!
Here's up close .....