Ok, first I'm new to the forum and this is my first post. I have a 86 wellcraft 23 nova xl, it has a 5.7 with a alpha one, i bought it have restored and finished the boat, out drive seems to be in good working order as well as everything driveline wise, took it out for the first time, and took it easy for a while, then went to open it up, motor was running strong however it seemed very slow out of the hole and then topped out at 4000 rpm (on gauge) and GPSed it at 35 mph, the prop is a aluminum 3 blade 19p.. I'm confused because I would think I would either have fast holeshot or low topend but not both. I'm thinking a 14 1/8x20 4 blade. Thanks for the help everyone