Im looking forward to your performance testing results. My dad flew in yesterday to visit with his stock 1975 Super Cub. Its exactly as it came from the factory with 800X4 tires except hes on his 3rd 160 hp engine and uses a 7455 prop. We had a take off/climb contest against my cub with borer prop, vgs, tundra tire etc cub . He could take off shorter, out climb me and out run me. The 75 cub is around 100 lbs lighter than mine. Only thing I could do is land shorter. Maybe I need thrust line modification so I can compete with a stock cub.