I've built and installed a stroked 4.6l with a 9.5:1 compression ratio. The build went well until the engine was reinstalled. The engine will not turn over with the plugs installed. It turns over like mad with the plugs out. I've had the battery and starter tested, they checkout fine. I'm running out of ideas and things to check. I'm hoping that someone out there might have some other things I should check. Thanks!