Its an 81469 XU7 which in HQ was called Chevrolet 350. Sold in Australia to consulates and also sent overseas to NZ and South Africa at least, plus probably Malaysia, Thailand etc. Sales used 84469 coding. But if its a later body, they were also sold in Malaysia with 3300 and 4sps manual, nit sure if they also used the XU7 coding but should be 8WS69 not 81469 model. Was it a HQ?

81469 XU7 is the correct internal GMH model and PO code for it. The cars assembled in Australia had an 84469 sales code on the BODY ID tag so its obviously not Australian assembled. QT516303 is a HQ number, no idea where they would have got the number from unless it was originally on the block
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It would never had tags on it like an Australian car showing paint and trim. What is on it are what the Malaysian Assembly plant would have put on it.