Read this plug please!

As IQ52 said-You read a plug way down the porcelain.

For you here's what you do.: Buy new set of plugs.
Head to dragstrip
Install new sparkplugs
Push car to staging lanes
Fire car, pull to line
Make full throttle pass
Kill ignition at the stripe
Coast to or get towed to pits
Pull plugs, inspect with magnifying glass or cut threads off.

The ground strap will tell you timing. The "fuel ring" and its location and colour will tell you about jetting.

Here's an example of a plug used for many dyno pulls. The fuel ring is dark and wide. I don't have a clue as to what fuel was used or engine type or anything so I can't really tell ya much about it. It is just an example of what to look for. Sorry for the fuzzy photo. The fuel ring is really dark and thick on this one where the porcelain steps up to the larger diameter porcelain. J.Rob