there is alot to explain but i know there are multiple articles and threads here about timing your gsx (im assuming 4g63t) here is something to at least get you started...there is tons of info out there as far as timing but just be sure to follow the instructions...

http://www.dsmtuners.com/threads/timing.513405/#post-153659009

You need to check the timing marks a timing light won't work

Gentlemen the op seems to be genuinely asking about ignition timing not mechanical timing. 2g ignition timing is fixed unless you've converted the car to a 1g cas.

I'm not familiar with the AEM V1 system but unless the AEM has a timing lock (like ECMLink), you cannot check timing on a 2gb CAS system.

I am familiar with the EMS. You setup your timing in 2 steps. This is also assuming that you can start your car & it will run good enough "as a starting point" to tune.
STEP ONE
A) Connect up your timing light.
B) Connect your lap top to the ems & start your car. Goto > Configure > ECU Setup > Set ignition...
C) You should get this window. It's worded kind of hookie but your timing light needs to match the display as close as possible (in this case 10.07*).

STEP TWO -You need set Pickup Delay Comp.

This is an option you will find under "full list".

This value is an offset between when the ECU receives the input signal and processes it. Every sensor has an inherent delay from the time an event actually
happens and the time that it signals the event electrically. This delay is very short but at elevated RPMs, it can account for timing errors of over 5 degrees. The way this is setup is to check the ignition timing at idle and then at an elevated RPM. If at idle the timing is correct (agrees with the computer screen) and when at elevated RPM the timing reads higher on the screen than the timing light indicates then the Pickup Delay Comp has to be raised until the timing agrees with the screen.

Lastly, this will not change anything in your timing table. This will ensure that the values that show in your table are actual what is displayed. In a nut shell this syncs the mechanical to the electrical.

Awesome, thank you all for the help! Turns out I had to use the timing light on the crank pulley, along with slightly adjusting in thru the AEM software. Was quite a pain to mess around with, but all is well now. Thanks again!