BBP conversion

I'm looking to change my wife's 63 Dart to BBP so I can: 1- Run a bigger brake and 2- Run BBP Astro Slots that I got from a buddy.
I have a stock booster for a 63. I am not necessarily wanting to change to disc brakes.

My question is, has anyone ever gone from SBP drums to the bigger Drums, and what would I need to do that? A whole spindle setup off a later year? A whole rear end off a later year?
As far as an aftermarket disc kit goes, this adds a buch of complexity that I don't think I need in a little cruiser with a /6, and a bigger set of drums would suit me fine (my 58 F1 runs drums all around and they work great).

Am I money ahead by just going with a kit and risking all the nonsense involved with aftermarket systems? Can someone point me to a thread regarding 4 wheel conversions to BBP on an early A-body? I couldn't find one. The car is my avatar.