Based on his writings, Mike favored inclines and dips over flat bench. He was especially big on dips, and he spoke at length to me about how he and Ray would really psyche themselves up to dip very heavy -- up to hanging 180 from their waists for reps. (When he said "psyche themselves up," I imagine that entailed popping Speed.)
That said, in an old interview, he was asked about some of his best lifts. He listed flat benching either 425, 440 or 445 for a 1 RM; I can't remember the exact number. He also said he singled 300 in a behind-neck press, and 10 good reps with 225 on the same.
I believe that, but I don't believe the 475*30 squat claim for a minute. Then again, that came from a magazine caption; I don't think Mike ever said anything about his best squat...Ray was the one claiming a double with 900 :/