The water pump is mounted on the front of the engine and is driven by the timing belt. When replacing the motor, or even just the belt, check the water pump, and if in doubt, replace it. A tube mounts to the back side of the pump and runs down the valley between the cylinders. These tubes tend to corrode from the inside out. Check the tubes for corrosion, and if pitted severely, replace them. What may look like a cracked block leaking in the "V" may actually be just at corroded water tube.
I suspect that the drive belt(s) will need to come off and all the pulleys, idlers and cam covers to get a the water pump and hopefully the tube, if it is the tube, can be replaced with the pump in place.
So, IMO, some stuff will need to be disasembled.
You had better print that link and take it with you so they don't dismiss you as a pesky customer.