I would have some serious doubts about the fuel line and pressure line being switched. I don't think that is would be possible to run for more than just a few seconds with the fuel that was trapped in the carburator. There are many more reasons that your plane could have stalled right after lift-off such as not having the high speed needle set rich enough. It could have been that you didn't have the pressure line hooked up and when you took off, there was no pressure in the fuel tank, causing the engine to quit. It may have looked as if you switched the lines because the impact could have knocked the fuel lines off which may make it look as if you had them switched.