To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your guide to reflect how your engine is wired.
Fig. Fig. 1 Ford 4.2L Engine Firing order: 1-4-2-5-3-6 Distributorless ignition system
Fig. Fig. 2 Ford 4.6L Engine Firing order: 1-3-7-2-6-5-4-8 Distributorless ignition system
Fig. Fig. 3 Ford 5.4L Engine Firing order: 1-3-7-2-6-5-4-8 Distributorless ignition system (one coil on each cylinder)
Fig. Fig. 4 Ford 5.8L Engine Firing order: 1-3-7-2-6-5-4-8 Distributor rotation: Counterclockwise
Fig. Fig. 5 Ford 6.8L Engine Firing order: 1-6-5-10-2-7-3-8-4-9 Distributorless ignition system (one coil on each cylinder)
Fig. Fig. 6 7.3L Diesel engine injection order: 1-2-7-3-4-5-6-8
Fig. Fig. 7 Ford 7.5L Engine Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise