Welcome squire. Always happy to have a new bod on our forum.
It could have been converted anywhere in the country. I purchased my beast here in NSW but it was converted in South Australia.
Do you not have the original engineers report on the conversion? My understanding is that it is always to remain with the car when sold. (I'll stand corrected on this point)
Maybe the RTA could assist. I'm sure they would have records of when it was done and the engineers report. But I'm sure that someone with more experience will chime in and help ya out with this.
Do you have any pictures of the beast? If ya do please feel free to e-mail them to me and I will post them on the forum for you if you would like.
CLICK ME to e-mail me.
Cam ;42