I have a KEM Equipment 5.7 in my 21' jet. I think it's a little under powered at 260 HP. I'm thinking of trying to find someone here in South Central AK that might be able to take my engine and squeeze it up in HP to about 375-400. I keep wondering if that would work or would I be better off dropping a 383 stroker in there. Any thoughts on the best option? My 350 has only about 40 hours on it. What would it take in $$$ to tweet that engine? I'd like to do it this winter when the boat's idle. I don't have the knowledge to do it myself.