a couple friends and I were looking in an old motor manual,and we began talking, add the following discussion came up were the 394, and 400 engines available in '64-'67 mid size cars??

 

I'm not exactly sure what the question is.

The 394 was last built in 1964 and was ONLY offered in the full size cars, NEVER the midsize Cutlii.

The short stroke 400 was first released in 1965 and was ONLY offered in the midsize cars, never in the full size cars.