These chrome covers on my sons 400 in his Dart are from a buddy of mine who gave them to me for some work I did on his 68 Charger. These were on his 68 440 Charger R/T when he bought it in 1998. I dont even know if any 68 440 Chargers came with chrome valve covers but these do look like a factory valve cover but not sure what they are really from. I do believe my friends 68 Cuda 383 had factory chrome valve covers on it. Ron