'66 owners packet.....no affiliation !
https://www.ebay.ca/itm/ORIGINAL-1966-Shelby-American-GT350-Mustang-Owners-Manuals-that-came-with-my-66-/114680229283?oid=154321457585
https://www.ebay.ca/itm/ORIGINAL-1966-Shelby-American-GT350-Mustang-Owners-Manuals-that-came-with-my-66-/114680229283?oid=154321457585