I woould consider the four cylinder Rover engine to be the best for your use (diesel will be more economical, but if you don't have one, the cost of the diesel engine plus conversion would buy an awful lot of fuel!).
The four cylinder Rover engine is designed for the vehicle, and parts are readily available and fairly cheap. And you know what parts to get.
The Holden six provides increased power, but for your use this is unlikely to be a major factor. On the negative side, both carburetter and lubrication are likely to perform less than perfectly on steep slopes - whether this matters depends on your terrain. If not previously registered with the Holden engine, and you do decide to get registration (now or in the future) significant engineering costs will be involved. Parts are readily available and cheap, provided you know exactly which engine you have, and what clutch etc you used.
The Rover six is more powerful and drives well, but fuel consumption is going to be higher than the alternatives. And this engine does not stand neglected maintenance like the four does. Most engine parts are a lot harder to find, and some downright difficult or impossible, and you can expect them to be expensive.
Hope this helps
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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