Once the intake opens and the piston comes up, that's when it is tdc correct? How do you figure out the 30° with rotating the distributor? Also will that be clockwise or counterclockwise? I always just lined up the cap with the rotor, fired and set the rpm then grabbed the timing light. If there is a better way, I would want to know. I realize that is crucial. Everything will be primed and visually checked for oil before I start it. I have a Holley 750 black diamond series which was more costly than a brawler and used the brawler on my last motor which had a leaking float right out of the box. It stayed running but eventually started flooding it.