L6 power steering upgrade

[68 IRON]

I'm just tryin' to plan out my power steering upgrade. I've got the brackets and water pump pulleys, getting the harmonic balancer with pulleys next week (from NAPA) and now I come to the steering box. Anything special about
this that I should know? Do I need to get one from the same era truck or go with the vehicle I took the brackets and pulleys from or does it even matter?
The truck is a 68 c10 with a 230ci L6 (I know, I know they didn't do this...but they did). If I'm missing something let me know....lookin' for confidence to do this myself (with friends of course).