Critique/suggestions on 273 engine build

Plus a 318 looks exactly the same as a 273, no changes to engine mounts or anything, and if automatic or manual for that matter it will bolt directly to it with no other changes either.

Does this apply to a 65 cuda with original 2bbl 273 and floor shift auto?
If so, when the time comes it would be a no brainer for me to ditch the 273 too.