This will be very tough for BYU running a 3-4 ( 3 DL, 4 LBs). Utah uses primarily uses a TE and RB. Usually a 21, 12, or even 23 for the run game.
This gives them 5 OL, 1-2 TE or 1-2 RB, to match up vs 3 DL, 2-4 LBS ( depending on if they are in coverage) in the box.
I would feel more confident if BYU was a 4-3 so they had more muscles on the line to stop the run ( BYU defense weakness).