It depends on what you are going to do with the pulley system, I would go with a Vintage Air Front Runner set up and it comes with the pump so you dont need to find one. Billet Specialties also has a system and they come with the pump as well. Let me know if you are interested as I carry both of them and can ship one out to you.
here is a Vintage Air article we did up here
https://lateral-g.net/forums/show...ghlight=fesler this was on a 454 ram jet but will work the same for what you have and it shows the water pump. Good luck