This is really quite fascinating. So this is a homebuilt car with an apparently bespoke engine, and as oko surmises, probably built in the 1950s, or at the earliest about 1947 or just after.
It's a single-seater, so I reckon it must be intended for hillclimbs and sprints, but I certainly have never seen this car before, except for when I once found it and then lost it.
Do you know the engine size? Is it less than 1500cc ?