I agree on 40-50. I googled it once and found conflicting reports, and decided to go with 90. That was a mistake! I stripped three studs before I quit and looked up the spec in my TSM.
I should also mention those studs are not commonly available. Now the 74 has grade 8 bolts with the heads ground down a wee-bit as studs on the drivers side; used green loctite to hold them in the stud bores and to my surprise it worked!
Gabe, "reformed" Jeep hoarder.