Spark plug and timing recommend

RustyRatRod said
I think the best dyno is the rack anyway. Too many guys say "dyno this" and "dyno that" and they turn out to be posers. The track is where it matters anyway.

A track is a functional dyno for WOT performance.

A dyno has a lot of advantages over a track. It takes out a lot of variables and offers much more data.