my oil leak

ok the car has been sitting all winter long and gets the occasional start up...i have noticed a very big puddle of oil under the car....if its sitting it shouldn't be the rear main right more then likely the pan has a hole or leaking right??? im trying to track it down and i crawled under it and there is oil all over the pan around the bell housing its everywhere down there any ideas where it could be coming from....when i first got my 93 it had a leaking problem and it had two huge holes and was jb welded there was so much on the inside of the pan it help about a 1/2 qt less then it needed too

i stuck my head up under the car on the passenger side while it was jacked up slightly and the entire pass. side pan is coated not the heads so i think the valve covers are ok maybe a pan gasket i dont think low coolant sensor either because the pass. side is soaked its a good size puddle its probley as big as a 17" wheel with a 255 on it lol only thing i could think of big enought to comare ...it is jyst shy of touching both tires so its big it was started like 3 times this winter for about 5 minutes at a time so if its the rear main it must be horrible....