Let's be clear. It's a road car. You can't stay on the power for more than about 10s at a time anyway, and even if you flog it through the hills you're only on the power < half the time. You don't need to worry about cooling the box too much, and it is mechanically strong enough to handle that much torque.
If you cane it silly, then yes, it will suffer. But if you drive it around normally, and launch it from the lights some of the time, you're not doing anything outrageous to it. If it breaks, it will be because it's 30 years old.