Joe Frito said:Ford is already using that engine in Australia in the FPV Falcon. I know that this topic has probably already been discussed, but that engine would make sense if the new Boss engine line is not ready. Ford AU calls this engine the "Boss 260" and it is based on the '00 Cobra R engine, making 380hp.
We are excited that Ford might put this engine in a Mustang, now imagine having it in a 4dr.
http://www.ford.com.au/servlet/ContentServer?cid=1137385392589&pagename=Page&c=DFYPage
That's not an R motor. The Boss 260/290 motors use generic 03/04 heads with specific cams and a specific intake that somewhat mirrors the '00R manifold.
Below is a pic taken by Paul/Birdman941 at Al's shop of a Boss intake (left) next to a '00R (right) casting: