Need Info on slant 6 to V8 swap

37fleetwood pretty much answered all your questions but I would add a couple of things to the answer to question # 4. The V8 power steering gear is the same as the 6 but there is a special 90 degree fitting needed for a V8 setup for clearence under the stock exhaust manifold. On the manual box, most 6cyl's used bushings on the pitman shaft where the V8 box used needle bearings. The needle bearing design is considered stronger but both should work fine.
On question #5, your pump should be the same as the V8. It's the pulley and brackets that are different. If you're not interested in making the car look dead stock, use a complete '67-9 small block setup with the saginaw pump. It's easier to find and has fewer leak problems.
Thanks, Mark