I wonder how an alternator with it's electronic regulator would work in this situation. A relatively inexpensive 6v modern alternator might be worth trying but then getting the special made extra wide pulley for the 356 doubles or triples the price so maybe not inexpensive any more.
Maybe with all the money being spent on new generators and regulators that seem to keep failing, if the inexpensive alternator seemed to work then to keep the car looking original something like the
Gener-Nator could be worth looking into. The Power Gen is not as expensive as the Gener-Nator so might also be an option but the same pulley issue is present there too. Mike (su8overdrive) has a modern looking alternator on his 47 Super along with an Optima battery and don't believe he has had any issues.
As I recall a fellow in Southern Calif was having similar issues with failing generator/regulators on his 22-23 series and the Gener-Nator conversion seems to have helped there.
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