I was always told Hurst put the 440's in the 69 Darts and were then sent back to the factory and sold thru the factory dealers. I even had a guy tell me the 69 Dart and Cuda 440 cars were not a factory car because he said Hurt did the eng in them. But I told him it did not matter who put the eng in because they went back to the factory and sold thru Mopar. Not trying to be smart but thats what I always heard. Now you got me wondering. I even have a mag with a 440 Dart that says Hurt put the eng in it in 69. Now I gotta find out more about them. Ron