G'day Matt,
I had a look at this truck a few months back while I was working out that way.
From memory, (I'll have to find the photos), the engine is not a Holden, but the correct Chev OHV six.
The brake booster is not original, looks to be Bedford (?) remotely mounted where the LH fuel tank should be.
It is a very neat and tidy truck which IMHO would be an easy restoration. It is outside my budget, and also has the wrong badging, so I would like to see it snapped up.
Cheers, H