His car sounds neat but he's way off with the one-of-one spoiler story.
It was an available option on any 1970 Charger. Here's a 70 FC7 Plum Crazy R/T, original hemi automatic car. It sold recently on ebay but I know this car from when I was living in Colorado back in the 1980's. I have seen several over the years with factory decklid wings as documented on the buildsheet.
And if I recall my Mopar autoshow 1970 Charger trivia, those Chargers were orange 440 Six-Packs cars, all with sunroofs and all with luggage racks (no wing spoilers).