Slipping Clutch/ Contamination Issue

[mark4g63t]

Hey guys, so I've been battling a slipping clutch because of what I suspect to be caused by contamination. I've dropped my transmission 4 times now and have replaced my rear main seal and its housing, oil pan gasket, and axle seals. Had the flywheel resurfaced to .610 and got a new 2600 pressure plate, because I thought mine was a 2100, and a new sbc-tz disc. Somehow I believe motor oil is getting through my bell housing and onto my clutch. From the pics below it looks almost as though it is coming from the headgasket, oil galley plug or its gear oil and coming from my input shaft (fwd).
Any thoughts?
Thanks, Mark