The three Overbrook boys, armed with a gun and fresh from a game of basketball, searched for their target, police said. It was 8:30 p.m. on a Thursday. The boys - ages 14, 15, and 15 - first eyed a man and his dog. Then Jim Stuhlman appeared on the 6400 block of Woodcrest Avenue with his labradoodle, Molly. Stuhlman, 51, was older than the first man. And Molly, the boys later told police, looked "weak or soft