The 2JZ does not directly bolt up to the tC. The transmission will not bolt up either. This car is front wheel drive remember. If you wanted to drop in a 2JZ, you would first have to change the whole drivetrain of the car, possibly removed the gas tank, and other custom fabrications before even thinking about dropping in a RWD block.
Changing the tC into RWD would easily cost nearly 10grand with parts and labor. There are many other factors that add up to why you shouldnt make this car RWD. It simply isnt made for it.
Yes, the tC's motor has forged internals, and can take a beating.
But remember, the stroke on this engine is very long, and while these pistons are tough, they take a beating when pushed hard. If you are looking to make over 300whp, and keeping your tC daily drive, definetely upgrade your pistons and rods.