Big leak...

[brainbug007]

In prep for starting up my engine soon as I finally got most of the wiring sorted I filled the engine up with oil today. As I was pouring the oil into the rocker cover, a small amount would leak from where I think was the sump near the engine mount / oil pressure switch. It would then stop leaking as soon as I stopped pouring in oil? I checked the oil pressure switch and it doesn't appear to be leaking from there but from the sump somehow. So I thought ok, I'll come back to that as it doesn't leak while standing and only when I pour oil in. I then started filling up the coolant system after making a gasket for the inlet elbow and sealing it up nice with some holymer blue. Once I got about 5 liters of water in, oil starts pouring out of the front of sump?? As I added more water, more oil came out till the point where there was oil and water coming out Any ideas how on earth water is getting from the coolant system down into the sump?? When I had the engine out of the donor, I put a new head gasket on and there's no signs of leaks on there I'm trying to now get the sump off so I can pour more water in to see where its leaking down from but the sump is now stuck and wont come off. It seems stuck towards the back but I don't remember there being any bolts right at the back of the sump by the flywheel that aren't accessable without the gearbox being off??

Please help