I apologize in advance if someone here owns that car and I am insulting them, But I am calling BS. It may indeed be a low mileage car, and may have original paint and interior but there are some red flags to me. Theres no way that engine was painted at the factory that colour. My very early 76 had the light blue metallic like is on the earlier cars, after that they were a light blue. That doesnt even look like a Pontiac blue I have ever seen before. There are no core support to fender braces, the rear sway bar was left natural from the factory as well as the rear, those would at the very least have surface rust. They look like they have been painted with eastwood bare metal look paint ( I say that because they look just the same as on my 77 and thats the product I used). One other thing, I may be wrong with this one though, I was under the impression that up till 79 the bottom would have been in red oxide primer, not black. I have seen a few original cars and the bottom sides are truly a mess. The factory didnt care what they looked like and a lot of times they undercoated everything under there that didnt move.
Does look like a nice car though.