Welcome to the forum.
The numbers that you have given accord with each other datewise so it is more than likely that the tags all came from the GTR that you have described. Only an inspection of the vehicle by a person familair with the identifiers of a GTR can categorically say whether the car is genuine. It goes without saying that a GTR or XU-1 can be 'manufactured' by attaching genuine tags to a base model. Someone from a nearby Torana club may be able to assist.
Cheers
Bazza
Edited by Bazza, 19 July 2010 - 02:32 PM.