Motorhome 727 trans in an A-body?

Hi,
I have a 72 Dart Swinger that has a slant 6 in it. I'm planning on doing a drivetrain swap. A friend has a 76 Sportsman motorhome with a 360 and 727 trans. I'm going to use an A body 8 3/4 rear. What do I need to do to make this work? I heard I might not be able to use the trans.
Thanks,
Frank