I think Hal Copple is pushing 70,000 on his. I also seem to recall a thread where everyone talked about how many miles are on their cars.
I second what mattr762 says. The wilder the motor, the shorter the life span. The harder it is driven, the shorter the life span. When mine is done, I am going to just tear it apart and restore it. With that mind set, there is no such thing as 'high miles'
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Generally parts on these cars just don't last the 150K you expect out of a new car from a major manufacturer. Mainly because we beat on them. But then again, they are almost infiniately rebuildable.
Not an answer really, just some thoughts on the subject.
Rick