I have a 2005 F150 with a bad 4.6, chains went and it imploded. I found a low mileage 2002 Marquis with a 4.6. Both have the same 8th digit in the vin#. I was planning on swapping exhaust manifolds, intakes, oil pans, oil pick up, valve covers and dip stick tube. Today I was looking at the timing covers and it appears that they differ in the number of idlers. Question is can I swap the timing covers and will this make it work ?