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Which side wasn't firing?
You have two sets of green/blue/purple/white leads from the timer base to the powerpack. You may have gotten them reversed when you changed the pack out. If so then the firing would change from one side to the other. If this is the case then the timer base is probably bad, could be the connector. The timer base tells the powerpack when to fire and is under the flywheel. Typically the loss of one bank of cylinders is a pack problem. was this a new pack you tried?
Do you have a peak reading voltmeter, DVA? How about a multimeter capable of registering resistance, ohms? If so measure on stators forward connector 1/3/5 cylinders from terminals a to b. then check the rear connector 2/4/6 a to b. You should read about 850 ohms. These are the brown two wire connectors.
To test the powerpack we need the DVA reading.
Did you do a resistance test, any inexpensive meter can do it. If one of the charge coils on the stator is bad it will usually show with this test and we may not need a DVA, which can get expensive.
When we test the ignition we use a spark tester, timing light, ohm meter and peak reading voltmeter. With your limited tools about all we can do is swap parts or resistance tests. We really need to do voltage.
Most of the time resistance tests will show a bad coil. However it can't tell us anything about the pack as there are no test procedures other than voltage, which you don't have the meter for. So if the timer base and stator read correctly then the problem is probably in the power pack. The major cause of powerpack failure other than age is bad grounds. Are all your grounds connected?
I'm not sure what you want me to do? All of the necessary tests are in the service manual.