Is this some sort of joke? In this day and age do people really not know that you must change the oil in your vehicle. I know that the 4.6L motors are "indestructible"... but like anything, you must take care of it! Its truly a miracle that you were able to get the motor started after pouring in more oil. I've seen engines shut down due to owner malfunction and they never started back-up again.
Buy a new engine because yours is trashed. Maybe better yet, buy a bicycle because you don't deserve to own a vehicle.