Again, Knock sensor + gear drive = bad. It doesn't take much to irritate a knock sensor.
My 69 Camaro came with a gear drive on it, and even the quiet ones are obnoxiously loud. IMO, if you want blower whine, add a blower. The noisy ones are loud enough that you can't hear the exhaust- even a loud exhaust.
A basic Cloyes roller will get the job done, as well many of the other name brand sets, for under $50.