Found my dads original 1971 duster!

3forty said
The Twister package came with a slant 6 or a 318.
Welcome to the site.

Ya, I thought that’s what I read somewhere. Weird that they weren’t offered on the 340 cars. I’m not sure when they were added, but I love the look of them, so they will be going back on the car…..even if they weren’t original