There are various versions of this engine. One makes 270 HP, the next is 300 HP, and the latest and greatest is 320 HP. The thing to remember is that this engine is roughly the same size (4.6L) as the Ford Mustang GT (300 HP).

Now the new version, available this spring, is the superchaged version which makes 440 HP. Again, I'd look for a newer version already set up for RWD. The cost difference will be offset by the savings of buy parts to switch things over.