Water Pump Vanes (propellers)

According to 71 Manual the 340 had 8 vanes and the A/C 340 had 6 vanes. I also have a 75 Manual and doesn't have any specs on the pump. Also the vanes have a bigger Diameter on the non A/C, 4.38 for non A/C and 3.50 for the A/C. This goes back to recent post re; water circulating too fast.( do all A bodies overheat is the post).