The name "Cuda" actually started in I think 67 " not an A body guy" and they were A Body cars till 69.
If you got the Cuda option you got a 340 from 68-69 as the base engine with a smattering of 383 and 440 limited production offerings.
Not sure about 67, though I know for sure that in 67 on the Dart GTS you could get a 383.
1970 they turned into E Bodies and Cryco explained the rest.