They are torqued to 12ft lbs, but they will back off if you torque them that low, best to snug them up the best you can, I found a combination wrench can actually get you in to all the bolts with a little dexterity, and not having to remove the radiator, then, and this is imperitive, make sure you check those nuts again after riding a while, 99% of the time they loosen up at least once.
You would probably be OK using the gaskets again( if you have too, would not reccomend it), but I swear my EVO II system came with new ones, or maybe that was my Beet, etiher way, I had a extra set I think. But if I remember they were like 3$ a piece from Ron Ayers. Good Luck. And its a piece of cake install, you can get by without removing the Radiator if you choose.
"Now, I am Become Death, the Destroyer of Worlds"