Could be the balancer has slipped, or maybe you have a mismatch between the crank, balancer, or timing tab. There were years where the timing is checked from the 2 o'clock position, and years where it's checked at 12 o'clock.
8 degrees before TDC
Zero, tdc / top dead center
8 degress before TDC
0 TDC / Top dead center.
18436572
ZERO TDC / Top Dead Center
At zero. Tdc ( top dead center )
That year sets at ZERO TDC.
0 TDC
0 degrees at TDC./ TOP DEAD CENTER.
0 TDC / Top dead center.
Should be pointing at the wire that goes to the cylinder that is at tdc. You can contact me for more info as I am having a hard time trying to know what you are asking.