[Excaliber]

You could use "custom made" adaptor plates to mount the stock 4.6 intake system on the 5.4. That will solve the biggest problem with the height issue.

HOWEVER, the 5.4 does have a taller deck height also (measured from center of crank to top of block). If the 4.6 is all ready a tight fit to the hood even with an adaptor it could be a problem.

Your NOT from Australia, therefore, no "giant" hood scoops are allowed. LOL

Ernie