After living and working in dry Arizona for many years we are back in the northwest and getting quotes on a new Catalina 22 MK II - so we will have many questions.I would like to buy a used engine since I am putting out money for a new boat.Questions: do I need a short or long shaft. 2) What horsepower - we have a 5 knot current in the Columbia river at times.ThanksRik & Konnie