Tech as always has a very good explanation.
Heres a simple procedure that has always worked for me.
Pull # 1 plug (front drivers side)
Have someone bump the motor over,you holding your finger on the spark plug hole. "Be sure and disconnect power to the coil first"
Soon as you feel compression,stop.
Using a wrench on the balancer bolt,bring the timing marks up to 5 to 10 degrees B.F.T.D C.
Drop you distributer in with the rotor pointing to # 1 terminal on the cap.
You may have to turn the motor some to align the oil pump drive and allow the dist to drop all the way in.
Put the plug back in and it should fire up. You may have to turn the dist some.
Set timing to specs.