I have seen three CMP's fitted with 6354 Perkins. These are a cheap, readily obtainable engine of 120hp. Standard SAE bell housings which will fit the original CMP gearbox are easily obtainable but a box out of a Bedford, Commer etc that comes with the engine would be better.
Good boost in HP and rev matching to the CMP axle ratios is also good for a few more mph.
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