Marty, checked the orginal on my 68 CS, build date of Apr 03 at San Jose. 302 with auto and AC. Fan is marked C8SE - B. with a " CF " above the engineering number, and a date of "68 B". I guess the "CF" indicates the vendor? and 68 B is Feb of 68? Also a fan spacer is used with this fan, will measure the spacer if you need the length.