All the abstracts I have read showed no additional benefit to using nolva with ana. Just use the ana, but having nolva on hand just in case is a good idea in case you under estimate the amount of ana you should be taking.
I am very prone to gyno. When I use arim. alone at 1mg./day I get some itchyness but if I throw in 20mg nolv/day I'm all set, the nolv compete's w/what ever estrogen might be floating around.