The voltage pulses at the low voltage (primary) terminals of a coil connected to an msd box should be several hundred volts, the newer stuff advertises about 530 volts if I remember correctly. Best way to see what's there would probably be an oscilloscope with a voltage divider probe to keep the voltage from blowing the input amplifier away on the scope. Or, you could simply do what's already been suggested-check for actual spark. Even though I have the equipment to do what I described above, I would check for spark. An awful lot of stuff gets eliminated as possible problems if you have a good strong spark. If not, then get scientific and start checking individual things.
'71 chevelle, 468, TH400, 12 bolt posi w/3.08's, drinks a lot of 87 octane.