Duster 340 not a muscle car...

Bill Dedman said
...The writers described a muscle car as an intermediate body (there were no pony cars, yet... the Mustangs came a bit later in the year...) into which the factory had fitted a supposedly powerful, big block engine, ostensibly, giving the car "muscular" performance capabilities...

...I guess the only "musclecars" back then, to come from Mopar were the big block (and Hemi) Barracudas and Darts of 1967, 1968 and '69...

...So, the term "musclecar" in not about speed... it's just a way to classify a big block engine in an intermediate chassis. Has nothing at all to do with how fast (or, slow) it may be...
Click to expand...

That's the classic definition of a "muscle car". But as with anything, after 40-50 years go by, the lines have been blurred.
However, I can't agree with the statement about the only Mopar muscle cars were big block Darts & Cudas in '67 to '69. How could you forget about the most important muscle car ever (IMHO), the Plymouth Road Runner? Big block in an intermediate car, light, no frills... I think it meets the criteria! And of course don't leave out it's Dodge cousins like the Super Bees.