Why would you need to adjust timing? Are you planning on building a turbo kit? If so, is it right to assume that you are planning on using APEXi components such as an AFC, ITC, and AVCR for fuel/ignition management? If you are, I would highly suggest you look for other means of fuel/ignition mamagement, like a JWT reprogrammed ECU!
If you are not planning on going turbo or have no intentions to use an ITC for ignition control then I would say you have no need for an ITC!