An engine that makes big torque at low rpm but the torque curve falls off with rpm. That's your stock engine.
We alter cam timing and other aspects and now we're making peak torque higher. It's a more powerful engine. It's still torque production. It's just capable of it at higher rpm, which helps the vehicle accelerate faster.
Put another way: when you look at the horsepower curve, you ARE looking at the torque curve. The power curve rises and falls in proportion with rpm and a random *** constant, 5252.