Headers you say hah... You know there were two guys trying to remove them and once they were there, they realised they can't do it outside with car on the ground, lying in mud.
You either need to have the car in the workshop on the lift or take the whole engine out to remove them. I won't even attempt to do it as it can't be done. Once most of the parts are sold I will somehow take the engine out to take it to pieces to sell for scrap and headers will be removed or just cats cut off to sell them for scrap. If you need something else let me know.