Turning it too much one way or the other can get you where it won't start...
I prefer to find TDC, then set the engine to 10° BTDC and crank it up.... I've had good luck getting fresh engines to fire at 10°....
Then adjust the initial timing to max vacuum and try to get it to idle as smoothly as you can...
Then set total timing at 2000 - 2500 RPM after the engine reaches running temp (160° - 180° F)...
