The firing order for a Ford 5.0L is typically 1-5-4-2-6-3-7-8. You need to find the number 1 cylinder location on the engine (usually marked) and route the wires in that numerical order around the distributor cap. A diagram on the distributor cap itself or in your owner's manual (if you have one) is your best guide. There is no universal clockwise or counterclockwise pattern.