To find the correct firing order, you would need to:
* Verify the engine: Double-check the engine's identification number on the engine block. This will give you the correct engine type.
* Consult a Ford service manual: Once you have the correct engine identification, a service manual specific to that engine will list the firing order. These manuals are available online through various sources.
* Look for a tag on the engine: Sometimes a tag is affixed to the engine itself, specifying the firing order.
Without the correct engine details, providing the firing order is impossible.