That's a new one for me. You learn all the time.
The photo does not show the engine clearly, but it looks complex. The photo suggests a year in the 1970s, and by then the son of the builder had the car. He fitted Ford and Singer engines, but they don't look like that! Was the Maserati engine (a pre-WW2 1100cc motor) still installed as late as the 1970s?