I think the photo is the 1948 Mt Eden hill climb. The winning car was #66 (the second car back on the left). This was Des Herrick's midget powered by a Hudson Terraplane engine. The car had an interesting life and was converted to a circuit car in 1950, pranged in 1956 and rebuilt by Bruce McLaren (with Phil Kerr and Colin Beanland), was Chris Amon's first race car in 1959 and morphed over the years by a number of owners. It now appears as in Ray's Collection of Photos thread at post #676.