Fuel pump replacement, water leak

With anti-freeze that old, I'd be replacing it for 100% sure! That coolant has been sitting in there for a long time and slowly reacting with the metals, and the anti-corrosion additives were almost certainly all used up some years ago. I'd try to get the block drain plugs put and drain it from there so you can get some of the crud out that has settled into the bottom of cooling jacket in the block.

Grab the front of the pump/pulley and see if the pulley will wobble up and down any; that is a check on the pump bearing. If it wiggles more than just tiny bit, it may be on its way out.

Best of luck getting this thing going again!