4wd rear swap questions

[Brimow525]

OK, I am new to this stuff and want to make sure I do it right. Truck is a 70 K20 with D44 in front (drums) and a Eaton rear. 4:10 gears. I want the truck to be a safe daily driver and have had a VERY hard time matching parts for the brakes a such. So I bought a set of rears from a 86 K2500 with 103,000 miles on it. 4:10 gears, with the leaf spings. 10 bolt in front and 14 bolt (non full floater) in the rear. I have taken apart the front axle, just the calibers and dics. Going to get the disc turned, new calibers, bearings and seals. Now the questions are..
1. Should I mess with the front axle u joints near the calibers? They don't "look" bad, but they look kinda hard to get at and replace. Going to be plowing with this truck. Not off roading.
2. Will the springs bolt right up to my 70 frame? I wanted to keep the newer springs. More leafs.
3. Can I have the rear shock mount moved to the other side to the axle with ease?
4. What is a good reliable locking hub to get for this setup?
5. Will the steering bolt right up to the 70 system?
Thats all I can think of at the moment. Any advice is greatly appreciated.