60 chev to power steering

I have a 60 Chev Belair I need to change over to power steering. What newer then the original style box & pump is best. I believe the originals had a ram under neath. Any suggestion's on the easiest way to go.

 

I had a 62 Belair wagon with BB in it. I put a 605 box on it had to use an frame adapter but that was it. I think that you had use a manual steering arm on the box not sure why. It worked great.

 

Yep, 605 is a bolt on, quick, easy upgrade!

 

Gret thank guys, Where is the best place to get a rebuilt 605 box & pump.