Ballast, Blaster II, ohms, current, friggin volts!

Well, I could not get a msd ballast at the local napa or orilleys so I just got a .5. Now trying to calculate the actual voltage at the coil (at idle I reckon).

Since I have been sipping on some knob creek and playing with my engine test stand all day, I suck even more at figuring out the process of determining voltage at coil out of the resistor based on the load of the coil (I have no idea how many amps the blaster II draws at idle or any other time. I assume it is 4 amps at idle and 7 - 10 at 6k). One thing, it is a USA coil rather than made in the south east end of Srilanka, so that might be a good thing.

It appears we have some sharp folks here and I was wondering if someone would chime in on how to figure the voltage out of my circuit after the .5 ohm ballast given a specific amp load. Secondly what is the predicted amp draw of the blaster II at idle and at at 6K so I can be happy about my wiring choices. Oh yea I am building an engine test stand for this slant that was chucked out the back 40 for 2 years.

Much appreciated. GBA.