http://www.acmemarine.com/our_props.php
If you have an ACME prop, this webpage will help guide you to find the numbers on your current prop and help you find out the rotation, shaft diameter, and diameter x pitch. If you're running a lot of weight in your boat, the prop that will be best for you will have a larger diameter (make sure it will not hit your hull) and the lowest pitch (power). Higher pitch, will help you travel faster if you are looking for more speed. Since your gear ratio is 1.23:1 you can go with either a 3 blade or a 4 blade prop. (1:1 = 3 blade prop, 1.5:1 = 4 blade prop). 3 blade props are much more sensitive to damage than 4 blade props. I have a sport nautique with the same engine and it has RH rotation, 1" shaft diameter, and I had a 3-blade ACME part # 470 and upgraded to a 4-blade ACME part # 480. I bought my prop from propmd.com