360 LA rear main seal needed....help

Well I can see the oil drip from the inspection cover (auto tf727 trans). This is why i'm thinking its the main seal... but I did use a 4 pc pan gasket so its possible the ears shifted causing it to leak???

I'd hate to change the rear main but if i'm already going to have the pan off....wouldn't it be worth it? I don't wan't to replace the pan gasket to have it leak still.....

this the one: http://store.summitracing.com/partdetail.asp?part=FEL-BS40094&autoview=sku ???

also whats a good oil pan gasket to use? I hate those rubber cork ones.