I read somewhere on here that the 5.0L is possibly going to be the base engine for the Mustang GT in 2008. I found it in a search, and I cant tell you how old it is. But I remember it saying that the Boss is supposed to make somewhere in the neighborhood of 425-435 horsepower, and the 5.0L that supposed to go in the base Mustang GT is a detuned version. If any of that is true... I dont think it would be that hard to un-detune it. Even if we have to wait for a couple more years... they better make the wait worth it.
I also found some interesting numbers about this ''Hurricane'' engine on another forum... Around page 3 or so they start throwing around numbers about the block. Again if any of it is true, then it looks to be a promising engine.