So it sounds like you are going for a date code correct chalk mark original restoration.
To me a mini-starter works just fine (even though it is made by Hitachi Electric) because it 13 pounds lighter than the original and draws less current to do the same thing. Same for the alternator. The old DN mechanical points alternators are nothing more than a battery charger. You are running off the battery all the time and recharging when you can with the alternator that has to be spinning above 2,800 RPM to do that. A modern CS style one wire alternator draws less horsepower, lasts longer because of improved reverse cooling fans that blow instead of suck, and will it output from 120 to 280 amps of power at just off idle (1,200 RPM). Even though it will bolt in place and eliminate all voltage fluctuations (which will destroy a modern digital stereo or AM-FM radio), it won't pass a concours car show inspection (with or without the white gloves).
One is restoration to museum quality, the other is restification; to enjoy the car by driving it with modern conveniences and safety improvements (such as radial tires, disc brakes with dual master cylinders to isolate the front system from the rear). Neither is better than the other and both can be challenging and enjoyable to build. It is just two different ways to build a car. I of course choose a third alternative and build a modern track ready car in an old decrepid looking antique American muscle car body because I like to stun others with what these cars are capable of given half a chance.