68 Barracuda original /6 with 4-Speed?

In the US after '66 you couldn't order a 4 speed behind a /6. You could however gotten a 3 speed on the column (didn't come out with 3 on the floor till '70) as standard equipment.
You could get the truck version into the '90s. The 833 behind a 6 option in a car was resumed in the mid 70's and ran through 1980.