Not sure about the 3.9, but I have a 1985 110 with a 3.5 and it will hit 225K this week. Burns a quart of 20/50 every 1000 miles or so. Plan on re-building or replacing it with a 3.9 in the fall. It is regularly maintained and has no major issues although she is a little sluggish when the temperatures are low and she wants to warm up a little before getting underway.
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