I'm aware of what caster angle means.

Look at my setup... It's fine, and I run 36's (which touch the leafs in a factory configuration.

Going SOA is going to be a HUGE pain, and very difficult. I would avoid it at all costs. The diff housing is part of the drivers side mount.... to go SOA, you're going to have to outboard the springs... which are going to interfere with your tires when you turn.

You can build as much lift as you need into the spring hangers.

I would recommend a shackle reverse setup also.

87 Raider 4D56td v5MT1
31's..Basically Stock