Bubba, as silly as it sounds, get them as tight as you possibly can with the box end of the wrench. IIRC it is a 5/16 head, so you aren't going to get 150 ft pounds on it.
I always use a threadlocking compound, and if they look too old or any damage at all...replace them with new.
As far as real torque figures, I really couldn't tel you, but I'm sure some one can though. (asuming you can get a torque wrench in there)
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