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There are two methods of increasing top speed.
A rear axle with a different (lower numerical) ratio will help and there are / were numerous options available when new. You should be able to get a replacement that will fit directly (either as a complete assembly, or, as a replacement 'head' - leaving the casing in situ).
The drawback with this will be a loss of lowgear gradeability (though, I imagine you don't intend to drive fully-laden up steep gradients).
Another method is to fit an overdrive gearbox. The standard Bedford gearbox will probably be a four-speed direct top ratio, but there were alternatives available with five forward ratios - and these were usually overdrive top gears.
You would probably need to source parts from a breaker's yard - the possibility of finding new is remote, though you could find something from a reconditioner.
You will have fairly restricted options (some axles and gearbxes will be too large and heavy for your 'lightweight' vehicle, but both options (axle and gearbox) are possible - you could do both . . .
I no longer have access to the details that you require, but there will be specialists out there to provide the necessary information.
I'll see what I can find.
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