Have a 2002 4.0 SOHC vin E, 8th digit and found 2005 4.0 SOHC vin K, 8th...will they work? What do I need to watch out for, if anything? The 2005 engine has 120K for $500...he is saying grab everything on it, even wiring harness. Again, main question is how much work is involved to swap these out and will they work? Was told 2002 engine blew timing chain, but mechanic does not rebuild.