The badge on this convertible says 1964, but nothing under the hood corresponds to anything Chevrolet actually sold that year. A factory Impala buyer could climb as high as a 409, and that was considered serious. This car runs a built 427 on a full roller camshaft making a claimed 550 horsepower, backed by a four-speed that never appeared on any order sheet in this combination. Here is why that particular engine choice is a deliberate historical joke.