I talked to kyle.......I think at northwestfab about the same setup for my 72. He said it was best to use the chevy 203 box b/c you can clock the box and wont have the linkage issues. It will put the linkages on top. He also told me that I can choose what ever coupler I want. Fords have a 31 spline input, while most "doubler" cases use the 32 spline. I like his plates also b/c if you want to clock the 205 up or flat, you have the choice to do either. If you are in the market for the plates, I would give him a call. Very competitive price and very versitile.
Steve