The Fairey overdrive specifies the same oil as the gearboxes etc, but will benefit from synthetic gear oil.
The engine is not particularly fussy, as long as it gets changed regularly. I would agree with the above recommendations.
Overall, you have to remember that the engine was designed in the mid fifties and the drive train ten years earlier (parts of it go back to the early thirties) and any appropriate oil you can buy today will be better than anything the designers imagined, even if you get the cheapest you can find! But don't go too light in the engine - clearances are less than for a modern engine.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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