Am I looking at this accurately?

TIMING:
D16Z6 stock ignition timing: 16BTDC

Advance the timing by tapping the distributor toward the firewall.
Retard the timing by moving it toward the front bumper.

The mark to the left of 16-BTDC is advanced at 18-BTDC.
The mark to the right of 16-BTDC is retarded at 14-BTDC.
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A/F:
Rich means more fuel than actually needed for a "clean" burn.
Stoich (stoichemetric) means a perfect mixture of air and fuel.
Lean means there is not enough fuel, and too much air is NOT being ignited.

Ignition timing (timing) and A/F ratio are two different things, however...

Retarding the ignition richens the A/F ratio.
Advancing the ignition leans the A/F ratio.

Clarification: the A/F ratio measured is not the atmosphere existing within the combustion chamber pre-ignition, but post combustion, for example: o2 sensor readings, or emissions sample.