You will definitely want to check out King Cobra clutch kits, that is what most mustang guys use. This crate motor, is it bored .30 or .40 over? Pistons? Heads? Is it a true 302 or is it bored and stroked? Which shorty headers are you using? Cats? Exhaust? FI or carb? Cam? I am assuming that 350-375HP is at the crank because without a supercharger I am a little skeptical about that rwhp from a 5.0. More info please, would love to see what you've got going so far. Good luck.
Oh, maybe check out some mustang forums and see what people have in their foxbody's and that should point you in the right direction.