Putting in your tank without curing it could cause all kinds of problems. If there's dead material on it, it'll create a lot of ammonia as it decomposes. You DON'T want this happening in your tank.
You're going to need to completely cycle and re-cure this rock, in saltwater. I'd suggest doing this in a garbage can or rubbermaide tote of some kind. It helps to have a skimmer while doing this. There's all kinds of great articles on Reef frontier to explain how to cure rock.
There's a great link on using Muratic Acid to clean the rock and open up all it's pores too.