Advantages of dual ballast over single??

the 4-prong ballast resistor was used in factory-installed "Breakerless Ignition" systems from Chrysler .
The ohms are different from top-to-bottom , side-to-side ; both sides still function in a "start" and "run" capacity , just as a 2-prong ( e.g. , breaker point ) ignition .

For reasons of simplicity , the Orange Box ignition conversion includes -- or at least it used to -- the 2-prong ballast for breaker point-to-breakerless ( electronic ) conversions
( e.g. , the 1972 & earlier cars ) ; this is the one I used -- back in 1992 -- for my '72 Dart .

Can you "bypass" the use of the other prongs ? I can't say for certain ; I can only tell you that , on my daily driver 1972 Coronet's factory-installed breakerless ignition ( car was built in June 1972 , just about the time that even the 318 -- and possibly the 225 Slant and the 400 two bbl -- had standard electronic phased-in ) , the 3.5 ohm wire ( the lower connector ; top connector is , iirc , 1.7 ohms ) had worn itself out , broke-away from the harness , and kinda came-off when I last replaced the 'resistor .
I've had no apparent problems with its loss ; car still fires-off with zero problems , and the alternator gauge still sits ( little fluctuation ) where it's supposed to ( no deep discharge / overcharge ) .

Don't know if this is acceptable in the long-term ... Eventually , I'm going to buy a new harness , to replace the nearly forty-years'-old original .