Fire wall moving

Not the same thing, but we took a 65 wiper motor bracket and motor and installed them under the dash of my son's 67 Dart convertible. This was done for air cleaner and air box clearance (69 Super Bee stuff). It all hooked up to the 67 wiper transmission and has worked great since the install ten or so years ago.

There's no reason that the same principles that worked for us couldn't be done on the 63. It's just a matter of getting the parts and doing the work.