Short answer is: yes.
If the bike doesn't need to be completely rebuilt, it should do you just fine for a 600 mile tour. Do check in with the experts in the Touring Forum, but I suspect they will tell you the same thing. Of course, they will do a lot more quizzing of you

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Where do you plan to do your tour, and when?
Welcome to BF, and feel free to PM me with any questions

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East Hill