Yes you can advance your cam with the stock timing chain. Each tooth you advance the cam on the crank is 4*. Each tooth you advance the cam its self is 1/4* i believe. So degreeing a cam is pretty easy overall.

Simular to the subject, if you have a cam that is too big you can advance it and lower the powerband. If the cam is too small you can retard it to gain some power up high. I am thinking about retarding the cam in my Blazer to get some topend out of it.

 

Advancing the cam is turning it clockwise??

 

clockwise as you face the engine is advance.

 

Here's some help to this topic.

Big Tex wrote:
He is speaking of how you are closing the valves sooner.

Look thru this thread if you haven't already.
Camshaft-advancing