Exhaust Manifold Gasket
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Take it somewhere to have it done
It is a really hard job. Ussually those studs are rusted out and have a very good chance of breaking off when trying to remove them. Then you have a real problem. You have to drill and tap them out. ITs not fun. I took mine in and had one side done for 350 bucks. Shop around and get the best price. Also get good gaskets from either ford or a good gasket company. Don't buy the el cheapo gaskets from the parts store.