There's no replacement for displacement, no matter how little the gain. Plus, a .25" gain in stroke is pretty damn good, which will give more torque (something 4.6 lacks due to size). However, I'd wait to do this until you need a rebuild or to strengthen the engine since everything that moves needs to be replaced (crank, rods, and pistons). Eagle makes some good stuff for this. As for the 5.4, read the thread. The 5.4 fits w/o a hitch, except you may need to cut a notch in your hood or get an aftermarket one.
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