I have a 1998 Evinrude 25 that I want to convert to a 30. I have many friends that have succesfully converted thier 20 or 25 to a 30 by changing the carb. This has been done to models older than a 1990 model. I had a 35 carb and intake that I bolted right on to my 1998 Evinrude 25, but I...