I would use the Rover motor. While it is lower power than most Holden motors, the standard gearing is more suited to it - if you use the Holden motor, non-standard diffs, transfer or an overdrive are really needed.
The Rover engine will be more driveable at lower speeds, and unlike the Holden, does not starve for fuel, flood, or lose oil pressure on steep slopes.
If it is 7:1 (most likely) a modest incease to 8:1 or slightly more by shaving the head is worthwhile, increasing both power and economy. Early heads have not reliably got enough metal to grind by this much, but some increase should be feasible. The later heads have a boss on top of the head next to the rocker cover and between it and the carburetter. This should have 8 stamped on it if it is 8:1, and 7 or blank if 7:1, but beware that it may have been planed and not marked.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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