MSD pickup wires
The right way to do this is check "rotor phasing." Search it. Lots of info. And find/ borrow an older simpler, "non delay" timing light
https://documents.holley.com/techlibrary_rotor_phasing.pdf
What improper phasing does is the spark fires at the improper time due to reversed polarity, and so the spark is offset relative to the rotor position, and has to "jump" to get across.