I got the photos, it is an 8/72 Dandenong assembled HQ V8 2 seat van in Royal Purple with black trim. Firewall isn't original, looks like it has had a V12 Merlin in it!

It won't be a "built for SA" car as it has an ADR tag, but Mark unfortunately didn't get the VIN number so I can't get it looked up yet. Photos are huge, and not a lot to see but i'll see if I can get a decent size of the firewall photo and post it up.

HJ's were meant to be fitted with a 400 in very early stage as this engine was to be standard in Caprice, but only HQ's had them fitted afaik but never left GMH with one except possibly the 350Z when sold.