wfieldin I have only used electric water pumps for drag racing only. You are only going to save about 3-5 HP by driving the pump off the motor. Most electric pumps are good for about 1K hours before rebuilding. You can get an Edelbrock Aluminium water pump that weights less, setup a set of pulleys from March and have a real nice setup. Kirkham sells a better set of machined pulleys for a cobra. You have to watch when you go to underdriven pulleys and have a radiator that can't handle a worked out motor. Big or Small block. You are still going to need a belt for the Alt for charging.Stay with a 1-1 drive for the crank to waterpump or get an overdrive system which works better on the hot 100+ temp days.
Rick Lake