The tune I am currently running is one I found on Brent's site I believe, on the last dyno run the car put 350hp 353 ft lbs to the rear wheels while maintaining a 12.5 AFR across the board. Recently I compared the timing tables in my tune to those in a stock tune and they are identical. I have heard that these cars do not like a huge amount of advance but I also think the mods below should support some advance over stock I am just not sure where I should start the advance and how much I should add to start with. Any suggestions or advise would be greatly appreciated.

The car:
95 Z28 M6
Crower stage 3 cam 225/232 .569/.585 with Comp 1.6 RR's
Locally ported heads, maybe Stage 1.5
52mm TB
SLP CAI
36lb injectors
Edelbrock Headers no cat Hooker AeroChamber cat back
3.73's

 

I know this isn't what you want to hear, but every car is different and more timing isn't necessarily better. You might find that your car will make more hp/torque with less timing.
On the other hand it might want more in certain places.
Sorry I couldn't be of more help.