Check our FilzNZ and his post on the " Build Thread " as he is also from the Auckland area. He will be rebuilding a Boss 302 whereas you are in a position of getting your GT 350 approved under New Zealand's imported automotive rulings.
You definitely need to document that , as few folks realize that New Zealand consists primarily of two large islands ( and tons of littler ones ) and the Country may not be very wide , but it is quite long!! Assume you will drive to the very tip of the South Island to the track located there and your trip will be a monumental one considering the length. Will there be any competition similar to the One Lap of America track/race tours , or is this just a fun HPDE type event with no trophies or classes?