Supercharger fitment
while the 5.4 block is basically the same other then the alloy versus iron, the fitment issues would be beyond the realm of making sense to try and even using it. the timing cover, balancer, front accessories and belt routing would be so expensive it wouldn't be worth it even if you had all the good upper end parts. a lot of 2003/04 Cobra super chargers get purchased on ebay with people with good intensions on using them on their stock engines. once they get into it, it's quickly discovered the supercharger was the cheapest part of the whole application. just FYI