Once they get to this age they've usually been through 4 or 5 owners. Statistically, at least one of those is likely to embellish the truth a bit and make up a story that gets passed along with the car. Unless you have some kind of dealer receipt then all it is is a story. It could have had some stickers fitted at the dealer, but it could have also just been a V8 Kingswood and somewhere in its life someone decided to make it a Hj Sandman replica.

Does it have a GTS dash?