The 68 Hemi Dart (and Barracuda), wasnt a 'street' production car... It was an all out factory race car, with no warranties, and warnings that the car wasnt to be driven on the street.. The Hellcat is a street car... Also the Hemi Dart came with lightweight seats, a fiberglass front clip, no window cranks, or side rear view mirror... etc.. The Hellcat has all the bells and whistles of modern street cars... The Dart did 10.5 dressed as a race car with all the weight reducing touches... The Hellcat is a heavier car, and as mentioned, decked in full street trim and pulls the 10.5 1/4 time... So, I would say the statement that its the 'fastest factory muscle car' is pretty accurate