This electricity stuff is like magic . . .
Coil primary ohms in my new coil is 1.5, so I'm far off your target ohms of 2.4. My actual ballast resistor ohms are 1.8 (I measured too quickly, if I leave the test probes on the terminals for a second longer, the 1.5 ohm reading tics up to 1.8).
I found a lower ohm ballast resistor in stock that is 1.35 ohms, so I can use that, but with my coil testing at 1.5 ohms the ballast resistor would realistically have to be just 1 ohm to get a 4.5V drop when the car is running. Hmmm.
