I was able to take apart a non working GM A body tailgate window motor clean it up and get it to work. A Buick front window motor could probably be made to work. The Buick front window motor is slightly smaller and only has 2 prongs, the A body rear window motor has 3 prongs, one of the prongs is a ground.
If it mounts, you can wire it up. Pick up a connector at the j-yard or a local autoparts dealer. Nice find, BTW. Always good to know other cars can donate an organ.