Prop valve should be tucked up under the edge of the radiator shroud on the drivers side. Just follow the brake lines down to it.
I've replaced bushings on my K25 front springs, and the only difficulty I had was getting the truck up enough so that I could drop the axle down and get the spring shackle clear. I jacked the body high up by putting a wood platform under my hydraulic jack to give it a higher lift, and then putting the jack under the frame near the front door. Then I put a small bottle jack under the axle to support it when I removed the bolts. I did one side at a time.
Some of my shackle bolts came out without any problem, and then it was fairly easy to drive out the bushings. However, the large shackle bolts on the rear of the front springs were completely stuck, so I just used a 1/2" drill to put multiple holes in the rubber all around the outside and then finally drove the bushing out. I think its the large ones that also have a metal sleeve around them. I bent the edge of the sleeve up by driving a screwdriver between it and the shackle, and then had enough lip on it to use my air chisel to drive it out.
I used replacement energy suspension poly bushings and found it really hard to figure out exactly what parts combination I needed. I finally ordered what looked like the right parts, but I think I ended up with a few extra bushings. The bolts on the larger diameter bushings are also larger, and some were a really tight fit into the inner sleeves they provided. I ended up using the beaten up original sleeves in some cases. It was like the parts were mismatched in the kit.
