bioskyline said:you will need more than just the headgasket, you will need a headgasket kit, which will include everything from the HG up (intake, exaust, tb gaskets and new cam cover gaskets, most also include cam seals and valve seals) ive used fel-pro with no problems to date.
I used the Fel-pro kit as well and it worked great minus one thing. When you replace all the gaskets make sure you get a Toyota OEM EGR Cooler gasket. I haven't found one in a kit that is made from the proper material and it will burn up on you in about 3000 miles if you don't use the right stuff. Kits from what I've seen include a cardboard type gasket where it needs to be a graphite/metal type gasket due to the temperature of the exhaust gases passing by it.
Also, if you're aiming for 400-450hp and using a composite head gasket, better make sure that your tune is absolutely perfect. It has been done before but the composite headgasket isn't as forgiving at those power levels for errors in tuning.