Bearing in mind it's a while since I worked with anything that had a 'basic' ignition firing system virtually everything I've worked on in the last 20 years has been electronic.
But how about going back to basics, turn the engine until your rotor arm is pointing towards one of the leads, (doesn't matter which one) pull out the plug, ground it with the lead attached, make sure the king lead is attached between the coil & the dizzy cap. Put a 12V feed direct to your coil, then take another lead from the negative & touch ground, don't hold it to ground just touch it. As you do that the plug should spark, if it does you've proved coil, king lead, rotor arm, Dizzy cap, plug lead & plug, so a good chunk of the circuit out of the way, if it doesn't you need to look at those components.