new guy here need help

Hi everyone i just picked up a 88 chevy dually with a small block in it.. how hard is it to put a 96-97 votech in it?

Is it a square body or shitbox?

This is not my truck but this is the body i got

im thinking of putting everything from a 96-99 (that has the votech in it) motor, wiring harness, dash ect... has anyone done this??