8 1/4 Install Questions

The shock studs have a nut inside the trunk and can be removed that way. Soak the other end with PB Blaster or equivalent. The studs are strong. I just usually hit old ones with the impact.

No issue changing springs with the rear end installed. Just support the body with one pair of stands and the axle with another pair. Probably a good idea at this point to put new springs on.