Converting to Automatic? What do I need?

[Huskerboy2]

I'm thinking about converting my 4x4 '72 Blazer from a factory 4 speed to an automatic. What all do I need? Crossmember, steering column, linkage, remove clutch from pedal assembly, clutch rod block off plate for the hole in the firewall, etc. It's got a bolt in high hump, since it's a 4x4, would it have been a high hump whether it was an auto or 4 speed? How hard is this. I would probably go with a stock type tranny. TH350 or 400? Any thoughts on a good tranny? Thanks guys.