80ft/lbs is correct, but be careful - I broke one of the top bolts at around 70ft/lbs while installing the Frankenlift. Maybe it was just a bad bolt, but I backed everything off a bit. It was a $&^%# because it was welded to the top plate. I had to cut the broken bolt out and buy myself a new one.
Right after that happened I found lift install instructions that only called for 55ft/lbs I believe (looking for it now).
Edit: Yep, here they recommend 50ft/lbs...
http://www.bds-suspension.com/pdfs/034201.pdf
I also noticed that Rusty's recommends 75ft/lbs so I would say it depends more on the bolt you're using and you probably don't have to worry as much about stock specs here. From my experience 80 is overkill.