The last non-BCS team to win the title in Allen was Southern in Season 40 (we're now about to conclude Season 57).
That was the end of a fairly legendary run of non-BCS schools kicking butt in Allen -- UNLV, Boston U, Cleveland State and Yale won in four consecutive seasons from 34-37, and then Southern in 40. Morris Brown, UNLV and Utah were runners up in 31-33. Maine beat Weber State in the final in 29.
I believe that since 41 and on, every single team to even make the tourney has been from the ACC. (I kid, I kid.)