273 and 318 the same block?

No, get a 318 block if you wanna do that, there can usally be had for free.

Yup. I've got a '74 318 that I pulled from a Dart. It was running when pulled but in need of a rebuild, a good core. Was complete carb to pan, tried selling it for a $100 and didn't get any offers. Still laying around taking up space.