I have a 1987 Supra sunsport with a 351. I just picked up a 1200 lb fat sac for an oem Malibu. I layed it next to the dog house and up the rear seat in effort to surf. I also had 4 ~160lb people on board plus cooler. She could get me out of the water but would not go over 11 or 12 mph. This is the first time I have ever added balast to her. I assume I have the standard 13X13 prop. She is really not super quick out of the water, but pulls hard and consistent. One of my boating friends said to take the prop to Fox lake prop to get it pitched down and have a cup put in. I would love to spring for a nice new Acme prop but I don’t think it’s in the budget at this time. Would re-working this prop work as well. We mostly wakeboard and surf, almost never ski.