1994 Ford F-250 7.3l Diesel with 316k miles worth the buy?

I ve been looking at a 1994 Ford F-250 XLT 4x4 with the famous 7.3l diesel (unsure if it is the IDI N/A or Turbo or the 7.3 Powerstroke, owner does not say in the add) The main problem that I see with it is that it has 316000 miles. Would that be worth it? The owner is selling pretty damn cheap at $1900. He says it runs good but would there be anyway to tell how much life it has left from the initial check before buying? How much would it cost to rebuild one of these motors?

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