Distributer Timing

Ok here's the deal. I've got a 79' Monte Carlo w/ a semi-built 350 (come out of a 78' Camaro) in her. I'm wanting to have a little fun with NOS just for shits and giggles, but i need to retard my timing first about 2-2 1/2 degrees to help prevent detonation. I've got a timing light. Now how the hell do i use the damn thing. Some one, Anyone, Help

This saves me typing.

http://www.2quicknovas.com/happytiming.html
http://www.chevytalk.com/tech/ignition/Timing_Advance.html
http://www.sporttruck.com/techarticles/33703/index5.html
http://www.advanceautoparts.com/howtos_tips/automedia_html/ccr/CCR20020501IT/index.html?page=/howtos_tips/automedia_html/ccr/CCR20020501IT/CCR20020501IT.htm

If I was you I would just turn the distributor clockwise a tiny amount (2-2 1/2 degrees :iceslolan ). Clockwise retards and counter-clockwise advances. Have fun.