A good number of years ago I bought my buddies old 14-ft Wolverine (V-Hull). It came with a 7.5 hp Evinrude that was totally reliable and got the boat to where you needed to go but at 7 to 8 mph. I ran with this motor for a few more years, hunting and fishing with it. First time I put a borrowed 15 hp on her and she planned I was hooked. Bought myself a Nissan 25 2-stroke that I'm still using, now on my Starcraft 14. The 25-hp 2-stroke pushes the decked over 14 SF at 25+ mph with Bogs & I, figure this is roughly a 400 lb load in her (That's including the deck & Gas wiseA$$es)
My advise to keep this years costs down is find a reliable, inexpensive 6 to 10 HP and travel at hull speed. Just remember to leave home a bit earlier. Of course if you can find a good deal on a 25 to 30 HP jump on it! You've done a good job on finding a great deal on a hull, keep your fingers crossed on finding one on a motor. Also don't stop looking at boat and motor combos, they may be a good way to get a solid motor that's hung on a worthless piece of junk that no one else want's. Then junk the unwanted hull. And if you're real lucky the unwanted hull will be fiberglass and you can sell it to some energetic duck hunter looking to cut one down to make his own decked over project.
Best
Scott