Sam,
I am not sure where you are in this project but I rebuilt an internally regulated alternator with 105 amp parts and purchased a conversion kit for $20 or so to bypass the voltage regulator. It took less than an hour and I was done. I have provided the links for both sites below. It was virtually plug and play. I did use the 10SI alternator which is virtually the same case as the 10DN from pre-71 vehicles.
Alternator parts:
http://www.alternatorparts.com/gm_al...grade_kits.htm
Conversion kit:
http://www.wiringharness.com/custommods.htm
hope it helps.