It is worth it. Use a 96-04 Mustang K-frame. If it's going into a Fox, you must modify the right and left mount tabs on the back of the K-frame, but it's doable. You also need to go hydroboost, or manual brakes. A booster will not fit with any modular engine. You're on your own with wiring it up. You'll also have to do something about the intake. The truck intakes are TALL!! You can go with a customer intake or a 4.6L intake and get the adapter plates they make.
Are you going F.I. or carb?