Mike…..I use a 6hp Mercury 2-stroke longshaft and it works fine for the purpose you describe. It’s no speed demon but will move the boat at a leisurely pace. Also has enough power to get you upstream on slow tailraces if you don’t want to fool with a shuttle.
My motor has an external tank. If I had it to do again….I’d opt for a 4 or 5 hp 4-stroke that has the gas tank incorporated into the motor simply to avoid clutter in the boat. I’d stick with the longshaft (20″) due to the amount of rocker inherent in most driftboat designs.
