An interesting foot note on a 64 Thunderbolt 427 CENTER oiler with the very first Hemi Heads:
This car number 10, is even rarer. It was Ford's first experiment with a Hemispherical head engine. Car number 10 was the second "Thunderbolt" sold to Mickey Thompson for $1.00. He also purchased car #7 which was driven By Butch Leal as an unaltered factory original. It was the car #10 that Mickey entered into a contract with Ford to design and engineer a hemispherical head version of the Ford 427 Center oiler engine. The heads were cast from Chrysler hemi heads and machined to fit the Ford block. The intake manifold was designed with the carburetors side by side. The name "Thompson" was cast directly into the valve covers.