The N code is 383 code for a four barrel car so it has the comando or in dodge talk it would be a magnum.
Do you have the fender tag if so I could decode the car for you.
I used to decode tags all the time and got really good at just doing it from my head. Im now not so lucky after having a stroke I lost a lot of the memory.
Just pm me and I can help decode the whole car for you. Good luck.