Of course, Bert is correct.

We all played with cam timing quite a bit in my drag/road racing racing days, amateur-ish as we were. Advancing cam timing for peak torque at lower rpm, retarding for peak torque at higher rpm. Cam timing changes using higher duration cams has a more dramatic effect on performance than with stock cams; due to a greater change in cranking compression/dynamic compression ratio.

P/S, Listening to that Webra in the vid, it sounds like predetonation transitioning off idle. Could be the nitro content is too high, maybe bad needle adjustments, or maybe the cam timing is off too far. Don't know, but it doesn't sound happy throttling up. Makes me cringe.

If the Webra timing gears allow for a change in cam timing of +/- 6 degrees or less I might give it a try just to satisfy curiosity. Any more than that I would install in "straight up" and leave it alone.