I think A&M MAY cover the spread but I wouldn't run out and bet on them.
They may score early, but they will wear down in the second half. Johnny Manziel struggled badly against LSU in the second half and Alabama isn't as offensively incompetent as LSU / Florida when A&M played them. If I had to guess, something like 31-14 Bama sounds about right. Good game for two quarters or so. It might take Alabama some time to get it into gear though just because of the emotional win at LSU.
I think the computer numbers will rise enough for Oregon and the human pollsters will not waver on Oregon as #2 (as they haven't all year and would have no reason to do so now considering Oregon is playing ranked competition) so it looks like an undefeated Oregon will play an undefeated Alabama at the end of the year.