I would agree with those comments. I looked at a late 74 build HQ holden ute (9th month I think) in Adelaide in mid 2009. It was originally a 308/M21 combo but was running a 253/auto. I checked off all the details on the compliance and one of the issues which caused me to not be 100% certain was the original paint colour, which was Absinth Yellow (it was now a white ute). I had a bit of a look and couldn't see any yellow anywhere so I went a bit cold on it as I my son was going to buy it as a project car.
After reading many articles on this site and others it now is clear in my mind it was probably a genuine Sandman or at least the plates were. They were asking 7K for it and it was pretty straight with what looked like the original guards. Interior was poor and it needed plenty of TLC. Grill was from a Kingswood.
I kick myself now as I had written down all the Vin numbers etc and threw them away. It was originally a Belmont base ute.