LEts Go cONvErtiBLE!

i have a 4.6 w/ ALOT of miles on it.......140k.... yea ALOT!
i dont want to get rid of it and the engine is runnin fine....
id like to when im done get 400 to 450 horsepower out of it what do i need to do to repair the damage that all those miles have done?
and as for the power....HOW? and WHAT to do?
thanks for the help!

GreyStang

A) your engine would need a complete overhaul if you want to make serious power with it. and,,

B) you're never gonna make 450 hp from the 4.6 2V. Well, not for anything less than +$10,000