It'll only fit a 5.4L SOHC. Your best bet would be to sell it. Go to some web sites like
www.f150online.com/ www.f150world.com/ and the National Lightning Owner's Club site (link in my sig). Other than that it's useless and you wasted money. Are you sure it even works? And you're positive it's a 2001? Why the heck did they sell it? I just see too many red flags flying around that thing.