Roger;
No you do NOT use an external voltage regulator with a one wire alternator,the voltage regulator is built into or on the rear of the alternator........
You can buy this voltage regulator at any alternator shop,they usually go for 39.95 and it takes all of one minute to install on any old type ford alternator.... I bought the 19.95 Auto Zone special about six or seven years ago and did just what I have said,still working perfectly on my car.........
David