Seafoam is good stuff. For my Etec they recommend if you do a lot of idling to run the boat WOT for a bit to clean out the injectors. Not sure if that would apply to a carbed engine.
"Life is a matter of luck and the odds of success are in no way enhanced by extreme caution." - Erich Topp, German U-boat Commander, 1943.
When in doubt, set the hook.