s10 to 49 Olds
Yup, the kit was cheaper than piecemeal, and it all worked together.
From memory ( here we go again) The ball joints and spindles were compatible. As noted, I did have to shave the outer A frame a bit.
You may have an issue with the steering arms. I ended up with Chevelle arms to match the throw on my R&P, so I can't remember if the original arms fit the chevy spindles.
If not (bolt pattern) you will need chevy arms. You mentioned power steering. Good time to review the steering geometry. Is the pitman arm the same length as the original? Are you using the original tie rods? If all the steering is original, you will need the steering arms to be the same length (pivot length, not overall) as the original and at the same height and ackerman. Relatively minor job to bend them to match.
Don't panic, we can deal with that when you get there, just giving you a heads up.
reminder - the 7 inch booster is not ideal. Go larger if you can, or dual diaphram.