Timing question

[elektrik]

Hi guys. I'm sure this has been covered a gazilion times here somewhere, but I can't seem to find a tutorial on how to adjust my timing. Looking for not only what I'm supposed to set the timing to (I have a 350 engine) but what the actual timing mark means (after using my timing light, I noticed the mark is "above" the "A") and which way to adjust the distributor, etc.

Any links or help would be appreciated.

Thanks!!!