By the white marks for setting timing....

[jimdigs]

...if while looking at the white notch with a timing light and the notch is before the pointer a smidge (towards the firewall). Is the timing advanced or retarded? Thanks, Jim

[Festy46]

Advanced. Since the timing light indicates the point when the spark plug fires, your engine is firing before the two marks line up.

[jimdigs]

Advanced. Since the timing light indicates the point when the spark plug fires, your engine is firing before the two marks line up.

Thats where I want it. Thanks, I just didn't want to check the timing again if I didn't need to.

[1990new]

http://en.wikipedia.org/wiki/Ignition_timing

This wikipedia entry explains it fairly simply.