After tons of searching I think I finally found the boat I want. The only issue is it has a brand new raw water cooled 5.7 engine. I would use it 90 percent in fresh water but could have it in salt water for up to a week at a time a couple times per year without flushing it out. Would investing in a fresh water cooling system make sense or should I just run it as is? Also I would to have a shop do this because I don't have the time. Approximate cost to this? Other than that she's a beauty and in great shape for an 18 year old boat! I really want to protect the brand new (not rebuilt) engine though. Input please.