A lot of early Series vehicles that started out their life as positive earth have been changed over the years to negative earth - one of the reasons for this would be when fitting a modern alternator over and old generator, they are all negative earth units. If your vehicle has an alternator rather than a generator then swapping back would cause ‘Bigga badda boom’ as they say in the Fifth Element.
If you want it all original and you have a generator in there then it could be swapped back but there will be a few things you need to check before doing so - one fo which is the wiring to the gen and regulator, but I can’t remember exactly what changed here - only going off memory from other threads.
If you have no issues with how it is now, I’d just leave it, it makes no difference to the vehicle.
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