1972 Esso Extra by Kikuo Hira
You have the correct car, but 'Esso Extra' is a product of the team sponsor Esso and not the vehicle's designation. Also, Kikuo Hira was the engineer, but the other man in the photo designed the body.
Locked for you to provide the correct designation and identify the designer.EDIT:1972 Augusta Mk3 Esso Extra by Kikuo Hira
You have edited your answer to include the correct designation (Augusta Mk3).
That's good enough to earn the point! (The body was designed by Takuya Yura, by the way.)