I was always told Mr Norms did the eng swaps at his dealer on the 68 Dart 440. I know in 69 Mopar sent them to Hurst and they were built as 383 cars and Hurst put the 440's in and sent them back to Mopar so anyone could order one from any Dodge dealer. I had never heard that Mopar built the 68's as when ever I heard about them it seemed everyone said Mr Norms dealer did them in 68. Thats why I thought they may not be legal but if you are correct then they would be legal. Ron