The Robin Herd designed Mallite monocoque McLaren M2B was used extensively as a test car for Firestone.
It was never raced but subsequently evolved into the M2B, the first McLaren F1 car. it ran both a Traco Oldsmobile and a Ford V8. I like the sponsorship on the wing.
Standing behind the car are Bruce McLaren and Gary Knutson and Howden Ganley (In the T shirt) and Wally Willmott.