I have a 12 foot j-boat and i was wandering what would be the best sized engine to buy. It dosnt have to plane out. Just a fast cruse speed like 15mph would be nice. The boat is not with me at the time so i dont no the exact specs. Its 12 foot, about 3' wide and about 15" to 17" deep (pretty small). Iv had my eye on the Briggs & Stratton 5-hp 4-Stroke like the one Cabela's sells. Would this me to much for my boat. Tony