i recon back feed the pump, like you would prime a water pump via the oil pressure switch hole, its slow but it does work. then pull all of the plugs put and wind her over. get some oil pressure and run your engine then work out the issues after its been running for a while, id b interested to see the video because, that would help somewhat. we do that to the performance engines we build at work if they wont build pressure by just cranking. it normally takes a bit but