Check out some of the Coyote swap groups. There is a "Coyote Swapped Fox Bodies" group on facebook that has a lot of good info. I know you aren't using a Coyote engine, but a lot of the same stuff applies. For example, you can use the same swap K-member for a modular or a Coyote. There is also no room for a vacuum brake booster with any of the overhead cam engines, and all the late model cars came with electric power steering, so no mechanical power steering pump. You can put a Mustang hydroboost system on it, and supply pressure to it with an OEM electric power steering pump out of a Volvo CX70. That's just a few examples of solutions people have come up with.
Kurt