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As far as I'm aware there is no specific torque value called out for them in the WSM, but I would try 63 foot lbs, as others have suggested in the past (and not come back to comment that their wheels fell off...)
and when /if they do , I would assume the upper A-arm should be level or at a position the arm would natural be in when the car is on the ground under normal weights and loads.....thus not placing any preloading on it. (Just like the aft lower bushing on the front arm)