A 55 Chevy Bel Air crossmember, when flipped upside down with the ears removed 9/11" will fit if you feed it from the passenger rear side and use vanilla cream from a donut as a sliding mechanism.
The wiring from a Yugo should work, though you might need to replace all the wires, pins and connectors.
Ok ok, all I wanted to say was that I would ask this in the classic forum. Those guys are the ones who have done said swap and will know exactly what you need. I am also pretty sure I have seen articles on doing the swap before.
Good luck.