Hey Mark,
I don't know if this interests you? But This past weekend while digging around my parts I found a bare 9 inch housing that would fit in a 65-66 Mustang,This housing was in my racecar when I bought it as a roller.This is not an original hipo unit,It was made by somebody at some point. This is a bare housing,if you were looking to stay with 28 spline stuff you could run your current axles and drum brakes,therefore you would only need a centersection to make this complete. My friend who was helping me move engines and what not at the time said he's possibly interested in it for his fathers project car(he'd let me know),but you know how that goes.I see early 64-66 (non original hipo and shelby) 9 inch housings go for $200-$850,I'm asking $250. So let me know if you have a possible interest.Thanks