Try this method. It should get you close, provided your points gap is set correctly. There are different ways, but this worked for me.
Hooked up a meter, black to ground, red to wire on points right side. Key on, meter set to AC. Turn the rotor CCW until the mark is in the F zone. There is a keyway on the end of the advance rod that you can just see behind the nut that should be pointing upwards. If it is pointing down, turn rotor 360. Loosen right side points plate, hold red lead to points wire and slide it left to right until it just moves. Lock it down. Do the same thing for the left side, keyway down, moving left points plate and holding red lead to that wire.
You want to try and set both sides at the same point within the F marks. The right side plate is the big one in the back. It will turn both plates, so, do the right first, then the left. Then check with a timing light. Making sure that it doesn't go past full advance at 3000 rpm's.