This would be quite a feat to change to a different engine. However, there should be plenty of 4.6L available because it was put in a lot of different vehicles. I would just find locate a 4.6L or have the head gasket repaired. It may be cheaper depending on where you had it priced, I would suggest having a few more estimates done just to make sure because I am not sure just a head gasket would be more expensive then replacing the entire engine. There are cases when this is true but not sure this is one of them.
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Friday, March 20th, 2020 AT 5:20 PM