Al Pacino went completely method for his role in The Godfather. In the Hollywood icon’s new memoir, Sonny Boy, Pacino, 84, revealed he visited a real-life member of the mob to get inspiration to play Michael Corleone, RadarOnline.com has learned. “I still had to figure out who Michael was to me,” he penned in the juicy tell-all. “Michael starts out from a young man we’ve seen before, getting by, a little loopy, a little lumpy.” Luckily for Pacino, his fellow cast member Alfredo Lettieri, who played Virgil Sollozzo, had a friend who was involved in the lifestyle they were portraying in the Fran…