What identifies 69 Dart GT on fender tag ?

According to the links, the VIN of a 69 Dart GT should start with LP. The dealer data book is a little strange about what engine was standard. Both the /6 and 273 are shown as being standard.

https://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1969/69_Dart0020.jpg