In the Pacific Northwest the 1400 series props with a cutback trailing edge and some added cup are used by nearly all the top racers. The 1440 is the 3.5 prop of choice. It won the class at the NAMBA Nationals and holds the NAMBA straight-a-way record of 58 mph.
I was lucky enough to win the last two NAMBA Nationals in the A Stock class. On both occasions I was using a Mark Anderson modified Octura 1440 prop. I am still doing well with them when my driving skills are up to the speed of the boat. If you have the chance, use one of Marks's props. They really move your boat.