I'd buy an Edelbrock if you can stomach the cost. Next choice would be a Milodon or Flow Cooler, although I have not ran either one of those. The Milodon resembles the mopar heavy duty "police" style pumps with the ribs cast into it.

I used to buy NAPA water pumps for my daily driver (Chevy),and they would fall apart every few years - mostly in the summer. Same thing with their clutch fans. I now get my clutch fans from CARQUEST as they seem to last much longer.