Water pump difference isn't worth the trouble of swapping. If you're gonna replace the water pump for an "upgrade", your best choice would be the International pump with the built-in coolant filter base. Otherwise, if the water pump is good, it'll serve your purposes fine. We have two '95s, with 97,000 and 170,000 miles respectively, both on the original water pumps.
Bottom line, at the asking price, you're stealing that truck, esp. if it starts and runs.