I'd start off with a full once over over the car. Change all fluids and replace all worn bushes.
If the motor is healthy leave it.
Go with a set of -9's (GT-SS) and a decent exhaust. Cam gears, injectors, fuel pump, afm's & a tune should get you close to 450hp.
Other than that, a good set of tyres and maybe modify the transfer case for some better 4wd action.
Some nice brakes too if you plan to track the car and have some spare cash.