I personally would not run a gear drive in any of my engines. One of the reasons is that the gears will transfer alot of harmonics from the rotating assembly to your valvetrain, wich you do not want. A big advantage of running a timing belt versus a chain is that alot of the harmonics are absorbed by the belt and not transfered. In my opinion the gear drive is a cave mans technology way of cam timing. Oh and i dont really think you will hear the noise of the gears over the headers.
