Many thanks for your prompt and most useful responses.
P1800 box then and my M40 remote should fit the bill.
The car is a 1972 model, three piece grille, low indicators.
What's the difference between J-type and D-type? I understand J-type is 0.75 overdrive.
I think that I'll stick with current diff for gradeability reasons at the moment over pure hypermiling economy, but thanks for the good tip regarding 164 diff!
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