Actually Dick Dastardly seems to be based on a movie called 'The Great Race' which is, essentially, a 2 hour long live action Wacky Races film with Jack Lemmon playing the Dick Dastardly, dressed in black with a large hat and moustache. He even drives a dastardly-esque car (with Peter Falk as a Muttley-esque sidekick). This is far more likely than Wile E Coyote.