According to Graham Vercoe's book " Historic Racing cars of New Zealand " the car ran a variety of V8 engines from Mercury to Ford to a 5400 cc Chrysler, the Ford- Mercury's with various heads - Edelbrock and Ardun [ OHV conversion ]
Look at the field in the final shot the Gee Cee Ess looking very old fashioned against later 1960's machines and others
the final few shots to follow ;