Ticking noise, 383, can't locate the source

You will RARELY get a tick from rockers like you are moving them. Why not shoot a good video of it RUNNING and TICKING instead of a worthless one? That would be a lot better. So you're running stock paddle style rockers on aluminum heads. Did you get them set up correctly? How is the valve stem sweep and geometry? What cam and how much spring? If it's enough spring, you probably have a rocker about to punch through at the pushrod indention. A video with it actually running will be a big help.