With those A/C pulleys, you then have to run a huge multigroove crank pulley. I'm looking for a single groove crank/water pump set that overdrives the w/p. The best March can do for single groove crank and w/p pulleys is 1:1.
CVR does sell a serpentine water pump/crank pulley set that overdrives the water pump, but nothing for a v-groove belt