may depend on how you intend to use the boat.
if you use it with light load, only up to 3 persons on board, better boating water conditions, moderate cruise speed desired, you may be ok.
if you pack a lot of gear, tackle, "stuff" and 3+ individuals are larger than average, use the boat in most condtions (as long as it's safe) and like to cruise fast, i doubt 115 would make you happy.
An underpowered boat will make her owner very unhappy rather than a delightful escape and enjoyment.
A seatrail will ultimately be your best gauge. Best to do so with knowing how much fuel is on board, pick a day with your average boating water condtions and not glassed over waters, bring some knowledgeable friends for "ballast" and their input as you sea trial and look over the boat.
I'm sure some members who have owed the same boat can chime in with their experience and opinion on what power seemed good for that hull.