NO, the first injected car did NOT "sit dormant".
A Bigfoot would be genuine if it was an original car. No jerky boy, if Chandler re created one of his earlier trucks, it would be a copy. That is how collector cars work. When stuff like the Hemi Under Glass exhibition cars are sold for big bucks, they become either co9llector cars or copies.
Your Noreaster cars today are current cars, not the 1977 car. Even you should be able to get that. If you don't it does not change the reality of collecting cars.