while this might be doable, I think you might have problems if your tanks/healers aren't overgearing the raid. Most likely what the perfect senario is gonna happen, your going to end up overhealing one or both of your tanks to keep them up and not get killed with spike damage. Probably though, you'll get behind on one tank faster than the other, over compensate your heals on the dying tank and the other tank will drop fast. just saying, might be ok, but I'd bring a 3 healer just to be safe, raid heal and spot heal. 2 healing the begining of kara isn't that bad, but towards the end, it's a big job for just 2 to handle