You'd give up one, but gain access to 8 different engine dynos and two chassis dynos. One being an AVL transient AC dyno that can simulate full race conditions down to bumps in the track, wheel spin, gear changes, and pit stops. I think there is a youtube video of it with one of our Grand am motors going around Daytona.
I don't think the new engine will hit the parts catalog until late next year. Almost nothing can be carried over from the current windsor based engine so it's very expensive to build.
I'm planning on getting a 2010 mustang in the next few months. Any idea how well the 3 valve responds to all the usual bolt ons?