What Pitman arm etc do I need for this setup?...

Ok, then unless there is a reason to change them (it doesn't sound like there is, according to what you're saying), I'll be using my original '70 centerlink and idler. I'll just get a '72 or older manual steering box.

I will need to get a '68-'72 pitman arm specifically made for manual steering though, correct?

Thanks for the assist!