At least in 1970, the standard engine in a challenger r/t was a 383, the 340 was an extra cost option, but then if you bought the 340, it was not an r/t. Challenger aficianado's know it as an A66. I have a friend who has had her A66 for at least thirty years. We havent seen a real A66, other than hers, at the spring or fall flings in a decade.
