Thirty years after their dramatic World Series title, the 1986 New York Mets remain a study in how to make winning ugly look good. After dominating the National League with a 108-54 record, the combustible roster of mismatched personalities clawed its way to the World Series and stunned the Boston Red Sox, erasing a 3-0 deficit in Game 7 to win the franchise’s second championship. The Mets’ starter that night was Ron Darling, and as he recounts in his forthcoming book, “Game 7, 1986: Failure and Triumph in the Biggest Game of My Life” (St. Martin’s Press), the three runs he allowed have tormented him ever since. He also...