were you going to bolt these over the block off plate? Are the center holes on that big enough for proper flow of a water pump? i know the timing cover water passages are big, but cant remember how big the block passages are. I suppose i'd just compare the ID to that of a -16AN fitting to see if they are in the ball park.
Question- does anything need to be done to ensure the flow is even into the 2 banks of the engine? A divider wall epoxied/welded down the center of the timing cover? Or will it just work itself out based on pressure? (related: can you run the output of the electric remote pump into a Y block and have it split close enough to 50/50?)