All of the current 650B tires should clear the arch, the tallest by just 2-3mm. Bottom of the crown at full bottom out will limit a few choices as they will hit.
I've read conflicting reports of the new Fox forks. Some say they are now reaching full travel (or more easily) but I've also read they still have the same old problem not reaching full travel without modding. Adding an internal 5mm spacer and you should be good to go with any tire safely......but always check first!!