cone posi. torq values

hi i am the proud owner of three cone stile posi units. my question is. i took one apart debured every thing that needed it and inspected it.the cones seats were a little scuffed up but not to bad. there was still plenty of clearence on the flat side. reasembeled and atached a torq wrench to an axel. 120 ft lbs. is that a good number.is it worth wile to change the springs and were would you geg them.do you still use posi oil aditive in this type.and last what are these things worth. If i sell a punkin with one in i don,t want to screw anyone.any help would be appreciated. thanks
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