Joe Estevez, who played the sailor driving the car (Don McCord), is the real life younger brother of Martin Sheen, who played Don's brother in the movie.
When "The Kid" shows his car to the Sheriff, the fuel induction setup appears to be four 2-barrel carburetors on a small block Chevy. Later, when "The Kid" is working on his car at the garage, the engine has a Holley 4-barrel carburetor.
The engine in the real '34 Ford was just a plain 302 Ford with a single four barrel carb. To make it appear more of a hot rod engine, the engine actually shown to Sheriff Roy Childress is the 327 Chevy from the yellow '32 coupe from American Graffiti with 4 two barrel carbs.