I strongly recommend getting some help from someone who knows how to do it. Ford sent all techs to school to learn the proper timing procedures on the 4.6 and 5.4 motors and also the 4.0 SOHC engines. Also, every bolt on the crankshaft and rods need to be replaced. They are ALL torque to yield. And you must also mark the connecting rods where the caps meet the rods. These rods are "snapped" instead of machined on the big end. I am the engine guy on our team and again, I am recommending that you get someone that knows this engine to help! Getting the chains off one to two teeth will bend the valves! Had a guy at work replace a head and broke all the exhaust valves on that side when he tried to start it.