How does cid make power?
Horsepower. Both engines make 600 hp. Honestly, who cares about torque? But let’s say (for the sake of discussion) the low RPM engine made 600 TQ and the high RPM engine made 450 TQ.
What is the difference in ET and MPH? I say none. It’s based on horsepower. And when two engines make the same power, the engine that does it at a higher RPM will be quicker and faster.