Quote Originally Posted by ckb07 View Post
I am concerned that the engine will run too lean and damage the pistons.
Sorry, I wasn't really thinking about the fact that you have a carb. Mine is fuel injected, so it's not on my radar. Running lean is definitely a concern with that much altitude gain. Not sure how much you want to mess with it on the water, but I would be taking a good selection of jets and get some suggestions from your mechanic or maybe get a hold of a local (Tahoe) mechanic for jet suggestions.
Maybe you could install the jets they think would be correct before you leave home and then keep an eye on it? Be prepared to get stuck into it on the water...