These are the part numbers from my rare stanza works tune-up manual (contains all the information to turn a stock stanza into a works stanza including all part numbers and specifications)
Also an option on E10 cherry/N10 Pulsar
22100-A7601 - Distributor Assembly (Common to G2 and G4)
22178-21000 - Support-Distributor (Common to G2 and G4)
22020-M0820 - Amplifier-CDI (Common to G2 and G4, E10 option)
22433-M0820 - Coil-CDI (Common to G2 and G4, E10 option)
Using these part numbers, i found some info in the internet.
"It is similar to aftermarket CDI ignition which can be had for a couple hundred dollars today. "
" A CD ignitor kit is available for use to accomodate the trend toward further high-speed engine performance. It features stabilized spark performance over the entire speed range. Use the same fuel pump, spark plugs, high tension cables as those designated as the primary specification parts. "
(this came from the datsun pulsar option catalog)
I would say electronic ignition would be the new technology, for example a series 2 bluebird distributor.
Or possibly MSD ignition which i believes allows you to adjust ignition advance etc through rev range.
I hope this answers all of your questions