My timing is stock, I got the MSD btm for free, but it's set at 0, I only use it for the capacitive discharge feature. I've tried messing with the btm, the car sputters and falls on it's face, I've also played with distributor timing. All the settings are and have been factory stock for 2.5 years boosted. It just runs the best that way for me. I run 94 octane fuel exclusively, that helps, the big injectors help too. With stock injectors and FMU I had detonation above 7 psi. Not now.