Imho, on the street, if you have enough motor, the power freed up by a pully swap will be too insignificant to notice. If you're not blowing away the tires, your motor is too small and the pulley won't change that.
Not sure where you're coming from with those comments. I haven't been worried about whether my car hooks on the street for 30+ years, since it's been that long since I street raced. My concern with using the car on public roads is purely whether the pulley change is likely to cause a charging and/or cooling problem.
BTW, on any decent track where I hook up, my car is traditionally very consistent, which is why it's been a good test bed to see what helps the car's ET & MPH. The crank pulley tests Dwayne Porter ran & posted years ago showed a Moroso underdrive pulley picked up about 10 HP at peak over an OEM pulley on a 500+ HP 383 he built. If I picked up 10 HP from a pulley swap on a 650+ HP 440, it would definitely show up on the ET slip.
