How far to rev this 273 commando build

My Barracuda has those mufflers with TTI dual 3s out to the back and their mild turn-downs. And no Crossover. I get a lot of compliments on the sound. This is just a [email protected] running about 180psi cylinder pressure with a 230* cam. They also sound good from inside the car, very mellow until about 4000, then screaming ever louder on the the way to 7000. But it's a pleasant screaming. At least from inside the car.lol.