I have a 79 22' schiada with a trs out drive and a 21 pitch mirage prop with velvet drive. The motor is a 550 hp 502. Boat is new to me and i was told it did 98 at Elsinore at the drags (old owner was boat racer). Ive rebuilt the motor with more hp now and have only seen 56 mph on gps at 5000 rpms. He said he used a 24 pitch prop to achieve that speed . Does this sound right to anybody? I would like to see that 98 mph.