hello, I rebuilt the carb on my 72 johnson 9.5 and afterplaying around with the fuel mixture it runs great, in a tank. I planned on replacing points and condensor since I just bought the motor, should I leave it alone since its running fine? also water is circulating good so should I replace the impeller.I do want it to be reliable. I have never messed with a boat motor and the people on this web sight have helped a bunch thanks. Jim