Okay guys, Ive got a good running 1975 85hp Evinrude that I've got on the back of my ski boat. I have been getting into barefoot skiing lately and the old 85 needs to be at WOT to keep me up. I have a 1973 115hp Johnson lying around that I've been using as a parts engine (there is a bad cylinder head and crankshaft bearing). Can I just swap the carbs to get more top end power? I know the throat size goes up but do I need to do anything with the exhaust end? Ultimately, I just want an extra 5mph out of it.