ziggy75,
You may want to be careful with using/rebuilding the crank-mounted PS pump. There are several threads like this one below on 460ford.com which seem to point toward a few "gotchas" if you want to use that rig. Not saying you shouldn't, just saying it's a bit of an oddball setup and has some potential pitfalls.
Here's an example:
crankshaft driven powersteering pump - 460 Ford Forum
If you go there and search on "power steering crank" or "power steering crankshaft" you'll get the full flavor of some experiences with this pump, what to do if you want to use it and also a way to change over to the more modern(?) version if you decide to.
Hope this helps,
Tom