Good idea with a high aromitizing substance.. Nolva is not as toxic as many beleive.. studies have shown up to 6 months on the drug with the worst side effect being diarrhea. Also, if your pinning your gear- your bypassing your liver so in that case it should be even less strenuous (sp) on the liver.
I plan on doing 20mg EOD on my next cycle, but I actaully have gyno and will be pulsing some orals..
If you don't have preexisting gyno then you might not need to, but if your running high doses of an aromatizing compound I don't think it would hurt at all.. I would reccomend an AI but I've also seen studies that AI's aren't sufficient in reducing gyno (in the event you already have it) but could supress its formation..
Goodluck man