Finding more our about when certain Hill Roads were used by NSCC and other Clubs and came across these via Bob Homewood - he has a facebook link about the great Late Ted Thompson of Kumeu and a few photos of the Mini-Ford,
A Ford crossflow 1500 Motor grafted to a Mini Gearbox running huge carburettors and 13 inch wheels on the front usual mini 10 inch on the rear.

The Hill Climb details ; Ted running a special Ford V8 engine in a Ford 10 - there are some pictures of the motor too

Name:  NSCC 1961 #10 November 12,1961 Ostrich Farm Road report Milan Fistonic .jpg
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Name:  NSCC 1961 #11 November 12,1961 Ostrich Farm Road results Milan Fistonic .jpg
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Forrest Cardon in the Lycoming - pre Jim Boyd - lots of other well known 60's [ 50's -70/80's ] drivers too !!