Just finished a video series on disassembly and replacing everything, doesn't look too challenging, just need a few tools and that book. I'll probably disassemble it, see what I need, and choose a kit based on that. I read in another thread about multiple places to get kits from so I'll choose one of those.
I've got a '64 cable shifted 727 in there now and it fits, works when I can get it in the right gear. I'll have to do some looking and measurement for the gearvendors unit and see where I end up.