a high effort N/A 5.4 2v will max in the 300 rw range and 280 rw with an auto. a 3v or 4v anything is more desirable.
my power was with stock cams, stock 9 degree cam advance(no vct/), stock intake, etc. 250/340rw SAE. with stock stuff. add 10-20 for a manual tranny. no bragging, just go with 3v or 4v.
right this minute 4.6 3v's are making 368rwhp with stock heads. go to modularfords for a writup and dyno. the 5.4 3v will join or exceed with development. ford is supposed to upgrade the 5.4 3v to 325hp/380tq jan 2008 or 2009 model. with torque exceeding 400 lb-ft easily it's no suprise to me.
later.