HI! need info. on junked dodge cornet!

hey everybody! well its been quit some time since I post anything here and well many things have happened.

I now work at napa auto parts! and well I think im in a good position as a young newbie to get my restoration moving on!

well I found a 74 cornet with a 360 and well I need to know if it'll go well on my 74 dart...and aslo how can I know what rear end it has? I want a 8 3/4 but not sure what it has...any way to tell? will it go on good on an A body dart?

thanks everyone if ya help!