Advice needed for high altitude 10 miler

I am very interested in swimming a 10 mile event this summer but it is at 5,500 ft altitude. I train around 2,400 ft. Does anyone have any advice for what I should expect, ie how much slower I will be or what type of training I can do barring traveling somewhere else to train? Also, any advice on nutrition for that distance race would also be greatly appreciated. Thanks. Sandy
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