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Det var åbenbart en meget alm. ombygning i RRC i australien, så sikkert også i Stage One da den kom:

Leyland P76 Rover V8 4.4 litre conversions in Range Rover

Leyland Australia made their own version of the 3.5 litre Rover V8 engine with a 2-barrel carburettor with an special inlet manifold for use in the Australian manufactored Leyland P76 model.
This 4.4 litre V8 engine were never used elsewhere in any other Rover or British Leyland vehicle.

It is known that special conversion companies for Range Rover in UK used the 4.4 litre V8 engine, like Rapport and Schuler. In Australia there are quite common in the 1970's to have the P76 engine installed as a dealer option or as a swap conversion from a donor P76 vehicle.

The 4.4 litre V8 engine deliver a very nice amount of pulling power and the motor characteristics is like a steam engine. The 4.4 litre fits directly into the Range Rover LT95 bell house on the gearbox without any special extra effort.

The 4.4 is easily noticed with the special rocker covers and the circular air intake.

Still today there are a lot of Australian Range Rover Classic's that run with the 4.4 litre.

http://www.range-rover-classic.com/Home/land-rover-brochures/range-rover---australia#TOC-Leyland-P76-Rover-V8-4.4-litre-conv