[P.S.]

The weird part is, the actual value of the capacitor (condenser) isn't nearly as critical as it's leakage (acting like a resistor). The only time you would have to increase the capacitance is when the coil has to fire more rapidly, like more lobes on the cam for more cylinders and/or more RPMs. Modern ignition systems do it by adding more ignition systems (coils) like each plug having its own coil and trigger mechanism.