Michael Ben Stiller looks up the Corvette online and says it's a 1958, when he goes in the grocery store, the owner acknowledges that it's a 1958, however, it only has single headlight so it's a 1957, or maybe a 1956, 1958 Corvette's have dual headlights.
It was a 1956 Corvette. 1957 Corvettes said "Fuel Injection" on the fenders. 1958's had 4 headlights.
Mr. Wilmington's car was not a 1958 Corvette; it was a 1956 or 1957. 1958 Corvettes have dual headlight mounts, while prior years had single.