Developed here and used for a long time with a fairly lengthy evolution. The later model ones started producing good power before they were dropped due to emissions standards problems.
They can be built for good power, there is pretty good aftermarket support for them.
Runs under General Motors, Holden is Australasian to the core. Rife in Aussie and NZ and not many other places. A few made it to South Africa rebadged as Chevs.
Also scored twin carb Manifold with carbs( as circled in pic) off same dude for $150. The intake setup alone is worth what we paid for them and the motor box combined.....