Power steering

[Mister laugh]

Well i am going to have some time tomorrow, and thought what better to do than to lay in the mud at my local yard looking for parts for a power steering swap.I have a few questions/confirmations i would like to make before i invest the time.

-I understand i can use any box from 73-87, but they changed to metric lines in 82. So for ease of installation i believe i want a 73-81 box from a 2wd 1/2 or 3/4 ton. Correct?

-Will the 73-87 pump work fine, and fit in the bracket correctly?

-I have a 6cyl with what i believe to be a non-integrated head. What am i looking for if by chance i see a 6 with power steering brackets on it?

-Lastly, are there any better ways to check a yard box other than look for leaks and check for rattling?

*EDIT*

-I guess that wasn't quite it. Can i use the pitman arm that is on the box i pull, assuming i get one from a 73-81?

Thanks

-Matt