Hi MW,
Correct on the model; but keep in mind, it's sized to suit a 'low output' motor, not a performance one like an LT1.
That motor was always going to have more top end than that chassis can use, so it was built for low revs torque.
That installation is about 50kg lighter than the OEM 6 one, too! And with the stock 4.11 diff ratio, it sure was quick off the mark...