small block oil priming question

I would set the dampener to 15 BTDC #1 compression (or whatever your desired initial is) then with everything all sorted out/ready to fire you want the rotor directly under the #1 cap terminal/wire or better yet slightly clockwise from it, ideally would be the trailing edge of the rotor "even" with the trailing edge of the cap terminal cuz vac advance will shift the rotor back CCW a bit (you do have some leeway there) but dead even or the above is fine. barely file the rotor & cap terminals as needed to keep the edges sharp as it requires less voltage to jump from/to a sharp edge than to a smoother one. Also Echlin has a rotor (MO3000) with a .060" longer blade to reduce the gap.