It'll fit. As said above, front 2 mounts dont line up. You can weld new tabs on the head, cut and move the mounts on the frame, or make a bracket to use both stock mounts. I've heard in order to use brackets, you will have to clearance the frame on the 04-05s. I think the easiest is to weld tabs on the head. Then if you ever swap it back to stock, the 600 will still bolt back in the frame.