About 10 years ago I put one of these from Auto Zone in my 1968 cuda when the original fried the points.The voltage remains more stable with one of these. Wow I paid about $18 back then so it's gone up in price.
http://www.autozone.com/batteries-s...ByKeyWord=VOLTAGE+REGULATOR&fromString=search
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I bought a few of the early Vreg's on rockauto for $11 in the last few years. They are thin chrome boxes and electronic, but w/ same connectors as a 1962-70 Vreg. Some name brand (forgot), but doesn't mean not Chinese-made.