New distributor/elelctronic ignition/coil

RedFish said

I don't mean to complicate things but... If you pre 70 model has its original charging system, it may not maintain sufficient voltage to operate electronic ignition properly.
A points ignition system will function on low voltage. The ECU needs 12 volts.

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You know, that has actually crossed my mind. I did however check voltage at the coil +, and it does show 12v so I think I may be ok. But I'm thinking of changing the alternator, voltage regulator, starter relay, just because everything is so old.

What would you suggest for an upgrade to the charging system, possibly maintaining the original wiring or changing it as little as possible?

Thanks!