If you go to www.LCengineering.com
they have so much stuff for that year Celica and up to 6gen Celica motor too. Unfortunately they don't have any parts available for the 1zz and the 2zz 7gen Celica motors, but soon they will.
LC Engineering is a racing parts manufacture for Toyota.
Check out the website you can find many parts including cams, pistons, turbo kits, clutches, flywheels and much more.
By the way that's a clean looking celica and a great project car.