Rebuilt 318 install problem

I only say this because some people think going ATDC is advancing when you actually retarding. I read this in a Mopar timing article below.

The point of reference is 0 (Top Dead Center {TDC}). Timing is measured After Top Dead Center (ATDC) or Before Top Dead Center (BTDC). The 0 reference means the number 1 cylinder piston is on the compression stroke at the maximum point of travel before beginning to move away from the head on its power stroke. All engines include a timing mark on the vibration damper and a gauge usually attached to the timing gear cover. The gauge usually measures from 0 to about 12 Before Top Dead Center (BTDC). BTDC is also called advanced timing because firing occurs before the crankshaft reaches the 0 point in rotation. ATDC is called retarded timing because firing occurs after the crankshaft reaches the 0 point in rotation.