Spark plug and timing recommend

roccodart440 said
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.

....I wasn't directing that at you, btw.

But you're right. If you have access to a dyno, go for it. But most people don't. The drag strip is much more affordable.