I just replaced the drag link and tie rod on my '74 2wd.

How tight should the castle nuts be tightened on these?

 

I seem to remember 75 ft lbs. for some reason. Try that.

 

i dont think there is a spec on those, i just did the same thing to my 2wd 76 F-150, i tightened it until it bottomed out and couldnt go any further and it wasnt too tight, there was still room for the ends to pivot slightly like they need to, now mind you i wasnt putting all my effort into it...basically you just need to have the cotter pin hole centered in the hole of the castle nut and it should be fine..........