84 k10 Steering box play

[84Silverado4x4]

Hey guys,  my 84 k10 is starting to have quite a bit of extra play in the steering and I'm wondering if there is a good fix or if replacing the steering box is my best option.  I recently rebuilt the front end and it has a 6inch suspension lift with dual shock steering stabilizer but I didn't change out the box.  I should be getting new tires here soon and an alignment but I would like to also get some of the play out of the steering.  Last time I had new tires put on and had the truck aligned the shop thought there was excessive play in the box.

[1967KaiserM715]

 Make sure the frame ain't cracked around the box, it's common especially with a lift


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[84Silverado4x4]

Is there a good place to get a new box? Also I know when I went through my truck originally I had to get a different year outer tie rod because the long tie rod had been replaced from a truck of an earlier year.  I also had to use wheel bearing part numbers that came out of it to match them up.  Is there a way to tell that the steering box is the correct one and year for my 84 just incase that has been swapped at some point in its life?