Kiko, I don't know about "down there" but here in the US most replacement regulators for your car are already electronic. Easy to tell. Your original, if it is the mechanical relay type, will have two fairly large resistors under the bottom:
http://vintagemoparts.com/img/p/97-396-thickbox.jpg
If it does NOT have those as pictured, it is a replacement electronic unit. Additionally, Standard Motor Products (Blue Streak) as well as NAPA (Echlin) market electronic units which do not look like a "stocker." Echlin VR1001 or Standard VR-128
http://www.studebaker-info.org/parts/NEW/partsimages/echvr1001.jpg
Anything above is direct replacement for the 69 / Earlier type alternator, which has one grounded brush (field terminal)
The 70 / later alternators have both field / brush terminals insulated and are properly known as "isolated field." This type normally uses the 70/ later regulator which looks like this:
http://www.classicindustries.com/images/productimg/m/mn1140.jpg
Now you could buy a 70/ later alternator, ground one field, and use it with your early type regulator, but if you try and use the 70/ later regulator you MUST have the later alternator