Help Me Choose Correct P/S Box

[Kawabuggy]

I'm working on a '70 C10 L/B truck. Just dropped a built 5.3LS engine with 4L60E trans into the truck the past 2 days. Truck came factory with manual steering. Since the LS motor I dropped in already has the power steering pump present, I want to upgrade the steering box to power assist.

Can anyone share with me from what year truck I can find a direct bolt in box that uses the same hose fittings as the current P/S pump has on it? Any other tips, or tricks I should be aware of regarding getting the P/S pump and new steering box to play well together?

I'm loving working on this truck already. So much room under the hood. The engine looks tiny sitting down in there! I can stand on 3 sides of the engine in the bay with my feet on the ground!

Thanks in advance for any help!