The funny thing is the engine they showed in Richard Petty's car(LEE 1) in Repo Men wasn't in the actual car. It was a big block Chevy with a blower on top. The blower would sit too high and stick through the hood. Besides motors with blowers are a drag race motor so Richard Petty never would have used one.
DoH Richard Petty Engine Repo Men by Michael Scarola, on Flickr
They didn't identify much about the General Lee on the show. In the episode 'Happy Birthday, General Lee', Cooter says he has a nice red-orange paint for the General Lee but he doesn't say what the color is called. They never identified the General Lee as a Charger either.
I don't ever remember the engine/size being mentioned in the series. I recently watched the whole series and don't remember anything about the engine being said.
I do know the beauty cars mostly had 440's and the stunt cars had the smaller 383 and 318. There was never a Hemi used on the TV series, only the movie.
The General Lee(beauty car) had a 440 although the stunt cars had 383's and 318's as far as I know.
In the 2005 movie the General Lee had a Hemi.
I hope I understood the questions correctly.