The lightning and HD trucks have stronger internals on thier engs,which allow for the supercharger.The stock 5.4 can handle no more than 400 hp before things start coming apart.The swap you mention has been done,but does require a lot of rework as you have mentioned.If you can find a totaled lightning and swap everting from the lightning into your truck,NOW you have a sleeper!!!.I have 2002 Ford F150 E/C S/b Stage 2 Roush with the option vortech blower producing 9ibs.boost. It dyno'd on a hot day (98 degrees) 300rwhp,400ft.lbs.torque. The eng is stock except for add ons for the blower,JBA shorty headers,lightning mass air,42lbs injectors,255lph intank fuel pump,Troyer Performance tune,21/2 y pipe into 3 inch single Roush exhaust.This truck has surprised quiet a few mustangs and ricers around here and still gets 23 mpg on the hwy.Future plans are for a set of trickflow heads and cams.Then I am at My maxium for the stock block. I hope this gives you some insight.