[JSeery]

Sounds like several issues here.

1. NOS condensers will most likely not work because of age.
2. The 8v battery is not a good idea, need to switch it back to 6v.
3. You need to know what the generator is outputting.
4. A digital voltmeter will not measure correctly around the generator and plug wires, you need an analog meter.

I would stop trying to run the engine until you figure some of this out, it would be very easy to damage the coil along with the capacitor.