Help me understand rebuild vs crate?

How's the rest of the package? Is it up for the transplant? Brakes, suspension, steering, rear axle, transmission?
It is a driver. I have replaced the floors and redone the interior. Everything else is pretty good. No power anything or AC. Very simple and working. Only upgrade it needs is the 8 3/4” 3.55 rear end is open not sure grip.