Struts coming loose?

66 dart sedan, redid the front end 2 years ago. Upgraded the strut bushings to the Moog pancake washer thing.
By chance I was under the Dart today and I noticed that one of the Nuts on the strut rod was finger tight at best?? How in the heck?? So I tightened it back, but now I wonder does anyone know the proper Torque lbs for that nut? Since it is not the original type, I can't find info on the spec. Help?? BTW it was only loose on the driver side, the pass side was still super tight. thanks