Water pump rotation in a big block housing?

The pump impeller design is generic. As long as the blades are straight, it doesnt matter where the bend is. They all just fling water outboard from the center water supply. I had an old bakelite impeller that was a solid formed disk with fins on it. The number of fins used to be dependent on A/C or not A/C as the cars had different pulley sizes and the smaller pulley made the impeller faster so they reduced the number of fins to prevent cavitation. I think B/RB are all the same now. CAT and Milodon still use the cast spiral blades, all others used stamped impellers.