Michigan vs SEC in Bowl Games
I'm not sure about your statistical record of games between the SEC and Big Ten, but Michigan is (after the Capital One Bowl game win over Florida today) 23-5-1 lifetime versus the SEC and 7-3 in bowl games versus the SEC. This was also cited at the close of today's game.
Additionally, a minor correction to your mention above of Penn State joining the Big 10 in 1990 - they were actually admitted in 1990 but did not begin football competition within the Big Ten until the 1993 season.