Easier to pull the whole engine but it will take more work. What Ford recommend is that you remove the K frame while supporting the engine with an engine lifting crane. This also requires a bit of work in terms of removing the steering rack, tie rod ends, front break lines and lower suspension arms etc.
Fun fun fun? Well the quick as dirty is lifting the engine loosening the sump without removing the engine or sump (leave it resting on the K frame) and manipulating the pump in and out; an awkward job. I have done this and I can tell you that while it works, there are times during this exercise that you will contemplate pulling the engine out instead.