Well, it requires a lot of modification to do this. First the 5.4 is wider than the 4.6, so they would have to cut the intake runners and weld them back up to make them shorter. The second part is then matching the ports of the 3V head as the intake will be setup for a 4V. I seriously doubt that this has been done as there is only a few performance shops that would attempt this and I don't know of any of them doing it. What I have said just covers the intake issue, there is other stuff that needs to be done but that is the big one.