I have accumulated a few mercs over the years. I have a 2003 9.9 merc 2 stroke short shaft. I also have a 1993 Merc 15. I want to make the 9.9 a 15 using the older motor. I know with 1994+ you just change the carb and the intake tube. BUT, I want to use the parts out of my 1993 15. Is carb going...