Drive Train Upgrade Suggestions

I believe you’re asking about the K frame for engine swap. The K frame for a /6, also works for the small block engines 318, 340, 360. Just need different engine mounts. I’m not sure about the 5.7 Hemi fitting the small block K frame, but that will be mentioned in a 3rd gen Hemi swap thread discussion.
Big block engines require a change in the K frame.