What a sweet-looking setup! As far as I can tell it looks like a 1930's vintage McCulloch centrifugal supercharger setup for the "flathead" Ford V8. These kits produced between 1937 and 1940 generated a measly 4 p.s.i. so they are not exactly a great performance boost. With a retail price between $85 - $125 USD back then, these don't seem like a great performance part but they certainly look cool!