I agree the manuals can be a little confusing. It seems since they call out torque specs on other fasteners on the reinstallation page that would also call out the torque for the 5/8" bolts there as well instead of putting them another manual. I looked around for some general torque specs for 5/8" bolts and they call out 150-170 ft-lbs but it depends on the grade of bolt. Like you recommend, I'm going to sneak up on it with my torque wrench and see how it feels. Plus, my torque wrench maxes out at 150 ft-lbs so I definitely won't be going beyond that.
What do you think about the pipe fitting that screws into the casting for the lower radiator hose? Some Teflon tape and a snug it up? Since my system won't be pressurized it shouldn't be too much of an issue. I find it kind of strange that the manual mentions installing the fitting after the casting is already installed.
By the way, how did you paste the image from the manuals on the page? I'm missing something in the process.
Thanks again for all your help (and patience!)