If you stand in front and look straight on at the fender tag, the build date is on the very bottom/last row. It would be the 1st 2 digits under the "SO NUMBER", in your cars case it was built May 27th, 1966 (527). Here is some information if you need it. http://www.66-67charger.com/forum/ubbthreads.php?ubb=showflat&Number=23399#Post23399
Thanks for the link, I'll add that to my reference library.