With my old combo, (a 454 turning an A impeller about 5k) the boat handled great ran mid 70's and had zero problems shutting down. Well I had oil pressure problems with the 454 (pickup fell off) so I had to pull it and rebuild it....you know how that goes. Now the boat is getting 1200hp and a 9.5" High Helix impeller and a shoe and ride plate. I'm wondering what to expect with this hull as far as high speed stability, shut down characteristics, where should I start with the shoe depth? The boat is a 1974 Hondo "ski Eighteen" it's real heavy, don't know how much it ways but it's heavy. Does anyone have any experience running one of these things hard? I think it's a splash of a southwind if that helps.