New ZZ4 coming have questions?

[Z10]

I finally had enough of the smoke and the leaks of what is suppose to be a 400 sb in my 72 GMC and I've got a turn key ZZ4 on a truck somewhere between Nebraska and West Texas. Now I have a couple of questions:

1. What shorty headers fit these trucks, (brand part #)
2. What fittings will I need to attach my old power steering lines to the new metric power steering pump?
3. What issues will I encounter when I switch from a TH350 to a TH700R4?
4. What else am I missing?