Study the stacks for a board with good grain not only on the end and back but also the sides. You want as little run offs as possible and if there any, not too abrupt. Also, if you are going to cut strips from the sides of the board be sure you pick a board that will allow for the right grain configuration(s)for that.
Hickory is tough stuff. I have made backing strips from wood with bad grain swirls and run offs and never had a backing failure but ideally you want to get a board that is as good as you can.