I have a Doug Nash 4+1 in my '65 Coronet. I was probably one of the first guys to do a 5 speed swap into a Mopar. I put the Doug Nash in my car about 30 years ago. I don't recall the serial number on the trans put it was an early one. It was more work than I could handle at the time but it was fairly simple for a local street rod guy. He moved the shifter box in the tunnel and made some mods to the crossmember. The linkage had to be custom built and there were a few other odds and ends.