What steering box do I want? '72 K5

[stomper]

I tightened up the steering box to try and make my K5 less squirrly at highway speeds. Now, my steering box is leaking PS fluid like crazy around the output shaft. Does the leaking PS fluid make sense? I didn't realise PS fluid could get out there? I've tightened boxes before so I'm sure I didn't go too tight - there is just a little play in it.

I'd like to reseal/rebuild the original box but not sure what I'm getting into - maybe gears are worn. Want to avoid downtime right now and just swap in a replacement box. I remember reading that later years had either a quicker ratio or progressive ratio but too new model year and threads will not match for hose fittings. Also recall a "red hat" steering box? What do I want?

I've searched threads with no luck finding an answer to my questions.

Truck will be mainly street driven with some light off-road.

What is the ideal steering box?

Where is the cheapest place to get one?

Can I rebuild this one myself?