If you're going the 9 inch Ford route, consider going with the 12 bolt center for it from Strange. Lighter internals plus a 3% increase in efficiency due to the pinion being closer to the center of the ring gear - all that = more hp.
I have already done one of these for my 67 TT Project. I went with the Nodular Case and Billet Pinion Support on that one. Depends what I can find as to what I will do.