SBM Gear Drive Timing
It's just a typical "noisy" gear drive, which serious gear drives always are (straight-cut gears). It's no worse than any others I've heard. I'm just not a fan of the sound.
Another issue was its detriment to the sleeper nature of the car itself, a ratty '69 Signet 2-door with quiet dual exhaust. Rust, body filler, bad paint, chalky SBP slots--she's got it all!--but that gear drive hints at something serious underhood.