Allen.
You would be safe with Ford eng.
Chassis no. is a strange one , 4 Lotus 31 cars went to Motor Racing Stables as school cars according to Motor Racing May 1965 , 1 x with 55bhp eng , 1 x 75 bhp , 2 x Mae , all fords. , but I have a note that there were S1 and S2 versions ???school 1 and school 2 , with a run of only about 12 cars , hardly time for an update model.
Still doesn't explain 31 JP 2 65 , as according to Doug Nye these cars were 1964 production , so another of lifes little chassis no. mysteries.
Bryan.
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