70$ voltage regulator vs 20$ one, is it worth it?

Keep in mind that the points burned up for a reason. Remember that the highest-amp alternator originally used with the VR-32 was a 40A unit. The 46A (next step up) and the 60A alternators got the heavier-duty VR-35 (now discontinued externally-adjustable version of VR-34) as factory equipment. The field circuit of a higher-amp alternator tends to draw higher current than that of a lower-amp alternator.

This is still worth keeping in mind even if you go to an electronic regulator; try and find out the ampacity (current capacity) of an electronic regulator you're considering that is of unknown duty rating.