My 360 build

So once you get the initial set you no long turn the distributor it's all inside springs and things! Lol I'm gonna have to take a look at my dissy this is something iv never done. I have set the timing before but I always just set them at initial and went with it. I have been looking at different timing lights and stuff. I have to get one and I guess I need one of those tapes that go around the balancer.
i usually find where it wants to be at full advance. lets just use 36*. Then i set the initial, lets just say 21*. Your difference is 16*, so that is what you allow the mechanical advance to be. IF using the FBO plate, use the 16* slot and your set. Then you set what RPM you get your total advance with the springs.