Those number plates are something I'd probably try and forget also.
I think Ian (GongZ) would be a close contender for the Z detective title also . The story you told me though got me thinking about the feature car and article. I thought it might have been Ben Ellis' 240z that had a 1JZ conversion, that car went to the UK a few years back, but I think it was a 71 240z.
But my memory did recall any early 240z getting a Toyota engine swap, bit a shame the old L24 with webers was probably discarded. I do wonder what the cars fate was after the impound though!
In terms of being a display car at the Melbourne car show, I think that's perhaps HS30 00063 ?
http://collections.museumvictoria.com.au/items/800697
Although this description says 1971 and not 1970. #63 used to be Frank Guilfoyle's car. He ran DatZed in the 80s.
http://www.viczcar.com/forum/topic/12106-love-this-photo/?p=144116