93 Cobra clutch

Newbie here,
I just picked up a super clean 93 Cobra with 55K orig miles. After a few hundred miles it has developed a terrible noise I'm told is the throwout bearing. The clutch seems to still function as usual but the noise is scary. Should I replace the entire clutch with a stronger upgrade i.e. Centerforce Dual Friction Kit or just the throwout bearing. Either way I'm paying the same in labor charges. The car has a V1 Vortech SC, shorties,h-pipe, Flows. I was told it has been professionally tuned and is pushing 400hp. Is the stock clutch strong enough for this kind of power? I don't want to be a cheapskate with this car but it has already set me back a lot of $$$. This will be an occasional weekend cruiser and will probably never see a racetrack. Did I get in over my head with a SC'ed car and novice mech skills? Any help or advice would be appreciated.

CW

Thanks for the input. This is actually the wifeys car but guess who pays and stresses? I think that 400 hp is believable. We had the plugs changed before we took delivery but I think they are stock Motorcraft. I didn't plan on buying one of these already heavily modded so I'm very nervous about the whole thing. It was just exactly what we wanted for a fair price so we did it. I ordered the Centerforce clutch kit and TB bearing tonight so we'll see next week. So it begins...
Thanks again

CW