Capacitor Discharge (CD) Ignition?

Advantage of the stock distributor, esp. if a 4 bbl equiped 273, is the timing curve.

CD ignition advantage is if trying to run larger spark gaps or other situations where higher voltage is needed. The actual voltage needed to cause a spark to jump across the gap in the spark plug depends on the gap and cylinder conditions at that moment. If it sparks at 10,000 Volts, then it doesn't matter if the system can only produce 15 kV. Multi spark is helpful in preventing misfires - more prevelant in 'hot cammed' engines with exhaust dilution at low rpm. Another reason for multi spark is the coil and CD ignitions are usually optimized for high rpm, and multi-strike is used at lower rpms.

Inductive ignitions tend to have longer spark duration than CD. That's not a bad thing on today's pump fuel.