15west, should you run it? You will only know that answer after the event. As always, it depends how much the race means to you, consider it in perspective of other planned events this year.
Touie2 it may be a case of resting, most orthotics will assist the action of per longus by controlling the cuboid position which is a fulcrum for PL. Sorry to be technical, but most devices (unless custom made for a specific purpose) will enforce some rest of PL. Hope this helps. Save the strengthening for when it's pain free.