The format as I understand it tends to favor rally drivers, hence Robby Gordon has been a participant. I would consider Ky. Busch, but instead of Stewart I would put Jimmie Johnson. He has off-road background, recent road racing experience, and as he demonstrated in trying to run down and pass Gordon last week, tremendous car control.
Carl Edwards, Kasey Kahne, Ryan Newman could be good choices along with Stewart and Busch, but first choice is JJ.