That gear drive doesn't sound that loud at all. I heard the Pete Jackson gear drives and it was really loud as compared to that one. Here is a video with a Pete Jackson Gear drive. What is your plans for the car? Do you plan to redo the engine and paint? I never liked a gear drive whine, but I love my LS3 418 with Harrop TVS 2300. I think it has better sound than any gear drive, and supercharger produces lot more power.
https://www.youtube.com/watch?v=KInDwDXLzeQ
Jeff