I have a Johnson 25hp on a Lowe 1548. I am not getting great speed and am having a tough time getting on plane when loaded with a full hunt load. I have a cmc tilt and trim to help but am still making a wake similar to a wake board boat and only getting about 10-12 mph under a full load. When the boat is empty this is not as much of an issue as I am getting about 25. Would the 35 or 40 hp carburetor be a direct fit?