Would an electric water pump overload the system?

[powermetal]

I have a '69 Camaro with an LS1 and the stock Corvette alternator. I don't have any fancy electronics in the car, not even a radio. The engine harness is stock and everything else is a Painless harness. I'm thinking about adding an electric water pump. Do you think that would be too much for the system to handle? I can hear the electric water pump change it's pitch when the brake or headlights come on, indicating that it is slightly slowing down. I was just wondering if the addition of another electric device would draw too much power and maybe shorten the life of the alternator.

Thanks for any advice!

Steve