you'll find there's only one value available, get an ignition resistor for a 55-59 Chev 12V at your FLAPS or any of the online vendors .... or just get a new 12V coil that's internally resisted [AC Delco U515]
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics