This movie, directed by William Friedkin, was released in 1973, which means it’s now more than 40 years old. But despite the limits of special effects at the time, The Exorcist remains one of the flat-out scariest movies ever made. Here’s a “Before” picture of Linda Blair as young Regan, the girl who undergoes some truly frightening behavioral changes. Tune in tonight to revisit the “After.” The power of Best Bets compels you…