road rides, i usu don't do much over 50, and i only use nuun for that. no other snax.
for a 1.5hr cross country off road race, i might have a gu as well as nuun before but only water during race.
i eat pemmican on off road rides longer than 3 hrs.
my concern for you is that you're gonna be in carb flu for that ride. It took me a solid 4 wks to transition. maybe since you've already done a week, you won't bonk, but that would be my concern.