He played against NC State last Friday so that would be 8 days of rest.
If he doesn't play Sunday I would believe he will definitely be ready for start of NCAA tourney. Clemson will be one of top 4 seeds so will have first round bye and home field until final four. So, he will have plenty of time to rest up and get treatment for whatever is ailing him (and won't have to travel).
No idea about drum. But hope it can make the trip to Cary Sunday AM.