When you do decide to do this, I highly suggest this bearing kit for the output side of the column. GM simply put a little rubber boot to cover the side that connects to the steering shaft and especially here in the AZ heat, that doesnt last long. I installed one when I rebuilt my tilt column last year and am happy with it.That's what I did. I replaced everything except the front springs. From the steering box out. I figured since it was apart. The steering column will be another project later.
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Let me know if you need any help with that column. I've got all the tools to do it and I'm local to you here in Mesa.