My 66 is mini-tubbed. I didn't do my own work, but it is the same as any other a-body. If you intend on putting the cargo area metal filler pieces in, you will have to widen them and make your own carpet. The piece that makes the floor flat will have to be narrowed along with the seat bottom and retainer bar. When you hang the springs from the frame, there's no room for exhaust on the right side because of the gas tank offset.
