steering boxes

I'm using an eighties metric chassis for my willys wagon project and I want to replace the power steering box with manual. The box is a Saginaw 605....
Two Questions:
1) is there a manual box that interchanges with a 605?
2) can a power box be used as a manual box?

Yes.

Go to the Borgeson site.

They have many photos of different steering boxes as well as noting if they fit the same mounts.