If you are referring to a u-bolt with nut then use the published values for the bolt size. Over torquing can distort threads or even stretch the bolt causing damage.
No specific torque provided by Ford. I think that it's safe to assume that Henry Ford made his u-bolts to Grade 5 specs. This will help. Recommended U-Bolt Torque, Suspension Replacement Parts (autoandtrucksprings.com)
Thanks for all the replies I’ve got so many Manuel’s and not one mentions the sequence or tightness ? I’ll turn them down tight. Good day.