I would take a look at Detroit Speeds 8.8 inch in 9 inch housing center section. I considered it for my 57 Buick wagon but decided to try a 9 inch because I already had axles. I think you need to change out one axle. Definitely worth a look imo.
https://detroitspeed.com/products/re...nter_sections/
I’m sure Donny can offer some feedback on it.