It may still be worth rebuilding Charles given the cast impeller height in that photo. As stated here, good pumps are hard to find. Don't order a Cardone Jerry. I just tried this route from Rockauto and it came with a stamped impeller. I ended up using a reman from Napa that looks similar to your photo.
Another rebuild source (from Charles) - the Flying Dutchman
http://water-pump-rebuilders.com