[DW31S]

I just read the old post on this car, and I have the HMM magazine also, and will say this, which might or might not be in agreement with others:
I have, along with my brother, father and grandfather worked at what was the third largest Olds dealer in this great country of our's. In my 32 years, and their MANY years, have seen many things that weren't "supposed to be available". I remember vividly a certain white 1965 Olds Cutlass that had a 425 engine when it arrived on the car hauler. I know the car well and rode in it many times, and know much of the history of the car later on into the early '70s. Did Oldsmobile build this car? Absolutely. Did the assembly line build it? Probably not. I know of at least 2 Rallye 350 model Cutlasses that were built with W-31 drivetrains---again probably NOT assembly line builds, but nonetheless Oldsmobile builds. Or, how did Ron Garey show up ot the Winternationals in a W-31 that wasn't due for announcement until after the race?
I'm not saying the Impala in question is real or not. It sounds as though some well educated people say it IS real, while it also sounds as though some other well-educated people refute it's authenticity. I have never seen it in person, and frankly I am NO L72 historian, so my opinion stands that it COULD BE REAL, and it COULD be an engineering study mule that got out. It HAS happened before. And.....the known mules that DID escape were NOT verified with a paperwork trail because they weren't planned assembly line builds. Those cars were assembled from different areas of the division if you will, NOT on the normal line in the normal procedure.
Along the same idea, I bought a 1990 Olds Calais (actually had to make a donation to a school) that GM (Oldsmobile division) had given to an automobile shop class to disect to teach about different functions of components of that car. The car I got had no VIN, so therefore had no title, and was never intended to be registered for street use. I originally had intentions of building a NHRA Super Stock car, but eneded up selling the car instead.
Maybe this Impala is bogus, and maybe it's not but I have learned over the years that anything is possible.
As to the records being available for certain GM divisions: Oldsmobile records are not available like the PHS and the Sloan stuff. The Heritage Center docs. are not as precise and definitive and PHS ans Sloan. Canadian cars are much easier to authenticate.