(Waking up an old puzzle from the dead)
The driver of this car is Dan (Danny/Don) Shaw.
It was raced at Harewood Acres in August 1957 as #77 (Triumph Special).
In 1959, it was raced at Harewood Acres as #12 (Devin Special).
In 1959, it was raced at LASC Green Acres as #140 (Triumph TR3).
It is a 1957 Devin SS, based on a Triumph TR3.
(Not sure about the following)
Possibly built with the help of Bill Devin for James Gary. Car was named the "Gary Special", and driven by Dan McQuilcken Kelly for Gary Racing until 06/1957.
At one point, the car was powered by a Buick 215 V8.
In its current, restored state, the car looks like just another Devin SS.