All Rover/Land Rover V8 blocks are essentially the same size, however Leyland Australia built a 4.4 litre version for the Leyland P76 saloon that had a 3/4" (IIRC) higher deck height and longer stroke. This meant that the motor is also marginally wider though almost everything on these motors is different to the Rover ones, there is a high degree of parts interchangeability. Although I would imagine that these motors are quite rare up that endof the world.