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With proper maintanance you should easily see 300,000+ miles. I replaced the head gaskets on my bro-in-law's 6.9L with 200,000 miles and there was NO cylinder wear. No ridging at all.
i got a '89 350 7.3L and shes still crusin at over 200,000 but half of those miles have been off-road and boggin so i imagine shes going to be truckin for a while, good luck