If not limiting to 1971 then the field is wide open and included quite a few turkeys. OTOH one of the best (with many imitators) was the Gumball Rally (1976) though most versions cut out the Jaguar sequences
If you watch Dirty Mary Crazy Larry, Peter Fonda turns into a dirt road while being chased by a cop and says, "Remember Robert Mitcham in Thunder Road? I'm gonna powder his face".
So the article with the best info is “15 little known facts about Harrison Ford’s “American Graffiti “1955 Chevy 210....article states 3 engines were sourced from GM (1) 1969 L88 and (2) 454s and the 454s were used as the”voice” over for the Trans Am
“...This vehicle ended up seeing some action as a sound -recording vehicle during filming of Smokey and the Bandit”.That from the article written by Ben Levine titled Five most iconic chevys in cinema history ...That’s one of the two times I read it.I think the other time I read it was when I was reading about American Graffiti.I don’t think it was dubbed over when the trans am was right in front of the camera they wouldn’t need to ,but when your filming distant shots and action sequences they use sound effects and in this case they used the 55 Chevy with the big block.The info is out there not making it up out of thin air.