Don,
Take two 18" lengths of, oh, say 14 awg copper wire (bare), bend to an "L" shape with about 2" of wire forming the base of the "L". Connect, via the base of the "L",one length to each binding post at the top of the ignition coil. Space the wires about 1/4" apart at the top of the coil and about 2" apart at the far end of the wire. Hook up a 12 volt source to the binding terminals on the side of the ignition coil, adjust the vibrator for a good strong spark.
What should happen is that a spark should be created at base of the wires. Since the spark is warmer than the surrounding air, the spark will rise up the wire. Just like in the old Frankenstein movies
Looking forward to the winter driving tests!