waterpump suggestions?
like others are hinting, the 8 blade flows more....at low speeds where it counts!
see the 6 blade is actually great at high rpm for cooling and for the fact it take less to turn it [6 blades] but at low speeds with a matched rad it does not move enough coolant-'overheat in the drivethru'
maybe if you were to use an extra capacity radiator the 6 blade would suffice, but I rec the 8 blade if you are un sure.