 FACT: When the young man who sells the guns to Eddie is sitting in  his Road Runner with the man who will steal the machine guns from  the Armory, the military man asks if the car has a "Hemi". The young  man says yes. "Hemi" refers only to the 426 cubic inch engine. The  Road Runner in the movie clearly has a "383" badge on the hood  scoop. This engine is not a "Hemi".