I am putting a 3.9 liter motor with a serpentine belt system and a ZF transmission in my 1970 NADA spec Rover P6 3500S. I have been documenting the swap on YouTube. Here are the links for the first seven parts.
Rover P6 Driveline upgrade part 6
Rover P6 Driveline upgrade part 7
Edward Hamer
Petaluma CA
Rover P6 Driveline upgrade part 7
Edward Hamer
Petaluma CA