340 Vs 360

Say for a minute you had a motor that had a perfectly flat torque curve from 1000 rpm to 6000 rpm and stays in the same gear. Discounting wind resistance the car will accelerate at a constant rate all though 1000-6000rpm because the torque is what is working. Yet the car is making 6 times as much HP at 6000 rpm it isn't accelerating any faster then it is at 1000 rpm.

Sorry you just proved my point the only thing accelerating that car is that the engine is going from 1000 to 6000 rpm (rpm ain't a by product).
Since your trying to say that engine has as much energy at 1000 rpm than it does at 6000 rpm. All you would need is a variable transmission that would keep the engine 1000 rpm, I'm sure that car wouldn't accelerate to fast and top out at a low mph. But now put a variable transmission that keeps that car 6000 rpm it will accelerate like a rocket and top out at a high mph.