Yes, I am fully aware of the textbook definition of muscle car. My personal feeling on it is if you could get a factory big block in a "pony" car they stopped being pony cars. I consider Camaro's and Mustangs with factory installed big block muscle cars too. When you put that extra weight up front the pony car lost its basic identity IMO. Not to mention the E body was just a shortened version of the B body anyway. The only place it had to go from there, again just my opinion, was into the muscle car category. Regarding the dart GTS, being an a-body and a total butcher job to get those BB's into them I could just never consider that a muscle car.
I am not trying to convince anyone, that is just my feelings on it. I suppose in retrospect I should just asked best looking 60's-70's mopar.