I would like to show how I made myself a short nose water pump. Having issues with water pump to radiator clearance and not being able to move the radiator is the reason why I did this. Doing this made me able to get the water pump 3/4" shorter.
FlowKooler water pump, part no. 1700
Shaft and bearing, part no. WKN2541-1
Seal, part no. 206U
I bought the shaft/bearing and seal from Kellogg Automotive.
You will need to have access to both mill and lathe. What I did was to shorten the top of the nose, and make the bearing counterbore deeper into the housing.
I also made various tools for easy reassembly. I also made a tool to get the seal preload correct; http://kelloggautomotive.com/pdf/Seal Installation Guide.pdf
Last step was to shorten the water pump pulley to the correct depth. I made a new flange and welded it at the correct depth on the pulley.