John,
I have had great experience with Ken. Although he provides restoration services of customer supplied alternators he can also provide you with a complete date coded restored unit. Saying this, if you only want an unrestored alternator he may be able to help you out.
Ken Bruno Motor Sports
110 Trembleau Rd Keeseville, New York 12944
(518) 834-9271
http://www.kenbrunomotorsports.com/main.html