Can i put a 4.6 in place of my 5.4
i have an 03 4.6 engine that i want to put in a 99 that has a locked up 5.4. Actually i'm trying to sell the engine to a neighbor who has the 99. Will it swap over and match the wiring harness, computer, pcm etc. etc. ??? If not, how hard would it be to make it work.