The voltage stress on the condenser (capacitor) is when the points open. The voltage then jumps up to a few hundred volts (primary coil voltage) which is then multiplied in the secondary windings of the coil to tens of thousands of volts to fire the plugs. The DC voltage on the capacitor after the plug fires (approx battery voltage) is minor compared to the primary spike.
I find it unusual that your system eats thru capacitors, usually they are robust devices, unless the current versions of them are junk.
Is it possible your coil is wired backwards? (-) side of the coil should go to the distributor points, (+) side to the ignition (key) wiring.
george
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