Which one flows better, factory 6 blade water pump or 8 blade

When it comes to cooling the hot rod, factory stock has never let me down. Shroud, 18.5 viscous fan, pulley sizes, it’s all good stuff. It handles a little racing. Just a 1/4 or so in the back alleys at a time. On the track it’s nothing.

I’ve had both 6 & 8 blades on the car and noticed nothing. The SB engine was in the 450 HP area.