I googled GSX and 57,860 (the mileage on the scam ad was the only thing I could see that was unique) and looky looky what popped up... http://dadsclassiccars.com/used-1970-buick-gsx-for-sale-in-milford-ct-44369 Looks like a car that Napoli Classics had; was discussed here before. http://www.v8buick.com/index.php?threads/70-gsx-at-napoli-classics-ct.328135/ Patrick
That poor car is a mess, if you look at the suspension bolts they are hardware store bolts, the hold off valve for the brakes is missing.. Maybe they used a 71 later proportioning valve?? I would check those VIN rivets, cannot tell for sure but look incorrectly installed. For sure have to check the frame numbers...