Im thinking about running aluminum water pumps (circulating) on my new motors, any con's to this, sugestions on brand, fresh water use.

How about an electric water pump. Big HP saver at the high RPMs we turn

I think electrolosis would eat away the anti-cavatation plate and you would have a leak in very little time.

I have an Edelbrock aluminum on a SBC from my 69 Camaro that I am currently rebuilding. Pump is about 12yrs old and has been seeping some water from the plate gasket. I took it apart to see significant pitting from electrolosis. I would think it would be even worse on a boat.

First small block i put in a boat i used car water pump , the backplate lasted 18months just rusted away.

I've had a Meziere on my engine for 4 years now and have not had a problem with corrosion. Meziere makes a very nice piece and offer them in anodize finishes.