I would put antiseeze on them anyways. It's helped me change out my dp after being on for a year. As for torque spec for the dp nuts, it's suppose to be 38-51 N*m or 29-37 ft*lbf according to the service manual.
There is a high temp anti seize, copper i think but not sure and yes you should. Be patient with install and you will be rewarded. If you have a Corksport you might need to open the flanges mount holes with a slightly larger drill bit if the flange warped after welding. I assume that has been fixed by Cork long ago though. Pm If you need any help! Good luck.