Aha! I'd forgotten about Pete Lovely's Pooper, although this isn't it. I'll give you 1 point for identifying the car and then buy myself a drink (of cream soda, my beverage of choice
) for providing the remainder of the answer:
It's Cameron Healy's Cooper-Porsche ("Pooper") Mark VII (circa 1953, rebodied in 1954) with a 1720cc Porsche four cylinder motor.
And yes, it was also raced at the recent SCCA Vintage event in Portland, Or.