383 build for efficiency

o.k. suppose you make 360 ft.lbs @ 2400 rpm.
now you go to peak torque and make 400 ft. lbs. @ 4200 rpm.You have nearly doubled your rpm but you are only making 40 more ft. lbs torque and probably using 4 times as much gas to double your speed.You only need about 40 hp to cruise at 50 mph and that is about where the cam in this example makes the most power with least amount of gas.