March 1965 Dodge launched the Go Go package for the Dart

Go-Go Dart GT's were sold in 8 of the western states and built in the LA plant till the end of April 1965.

It had the 10.5:1 compression 235 HP 273 with a 4-barrel AFB carb and came with the choice of an Auto or 4-speed and a 7.25 rear, finned rocker covers, chrome air cleaner and dual point distributor.

https://denver.craigslist.org/cto/5818244170.html

http://www.forabodiesonly.com/mopar/threads/65-dart-gt-go-go-edition.203872/

"...you could actually order your 1965 Dart with the Go Go package, which included 13-inch Cragars".

https://www.forabodiesonly.com/mopar/threads/1965-literature-for-your-car.425731/

https://www.hotrod.com/articles/link-to-the-past-1965-dodge-dart-gt-convertible/