8 3/4 build questions

I had planned to order new axles anyway since the 8 3/4 that I am planning to buy is just the housing.

Here is what I planned to do. Tell me if you see anything that won't work.

I have a 72 Charger 8 3/4 with 489 case
Buying an A body housing. BARE
pull the center section of the Charger rear
pull backing plates and brake parts off Charger rear
Take all parts and A body housing to a shop for rebuild
order axles when they tell me what they need
may change gears from 3.23 suregrip to 3.91's :scratch: