lots to question about that truck, but not for me to throw stones out there.
first issue I see is rear shackle angles are bad, suspension all the way around looks shady. but some things could just be bad pics.
next question is need for body lift
gears and setup , check for drive line vibrations
flex it out and make sure you don't drop a DS out of it's splines.
What are you wanting to do with it ? Why can't you build your 87 to handle what your wanting to do ?
I would keep the 87 and put a good modest lift on it and work on being a technical wheeler than a throttle junkie, if wheeling is what your wanting to do.