I have the same 1987 CVX-16 boat in red, but with a 1985 Johnson crossflow 115 HP. The prop has the smaller hub, yours looks like the larger hub being a looper. My best props are a 22" OMC Raker and a 23" OMC SRX over the hub exhaust. At wide open throttle, RPM's are about 5,400 to 5,500 and GPS speed about 55 to 58 MPH. Check with Jerry Sellner for props. He has some new Rakers and some SRX's. PM me if you want to talk boats. I have seen your boat for sale twice, and was tempted to buy.