67 Dodge Dart GT

I am gonna hijack your thread for a min.I have a 67 Dodge Dart GT with a 273 automatic and a guy I know has a 318 automatic for sale that was in an RV will that bolt up and all ok.I am not to much on these old mopars.I have chevys and pontiacs any help would be greatly appreciated and also it has like 69K on motor so would be a good motor for the dart if it will work
Thanks Olin