Design and production are 2 different groups, could be decades apart. The design was AMC, it was made, then refined by Chrysler. If a post said it wasnt a Mopar motor, this is probably what the basis was. Its a pretty radical departure from any V8 Mopar, could have been the AMC roots. Look at the oil pump, AMC all the way. Chryco made the AMC 360 until 91, that was designed in 70. Just sayin....I didnt make the claim, just did a little research.
