Toyota builds the strongest engines of any manufacturer bar none. They consistently over-engineer their engines so that the owner can at least DOUBLE the rated output with all stock internals before being concerned about the strength of the OEM pieces. Ask JMS001, he's doing the turbo kit, and he's already publicly stated the OEM pistons and rods are good for MORE than twice the rated output, the same is true of the 2JZ-GE, 2JZ-GTE, and 3S-GTE. The strength of Toyco OEM internals is legendary among import engine builders.
The very LEAST of your worries is strength of the internals. Quit BS'ing about things you don't know anything about.