Yes, I also I think I read something on here many years ago about the 440 Source brand aluminum water pump housings being cast with internal holes smaller than the cast iron Chrysler ones so people were having trouble with those.

For someone who has not already purchased a water pump, or has one that is not doing the job the Edelbrock water pumps work great as they have long curved blades to move max. volume and little to no dead space. I've used the SB ones, and while they cost more than most of the others I think it's worth it for the more serious engines that do tend to create more heat.