Make sure the oil is coming from the seal area and not the exhaust. There may have been a lot of oil residue in the case/exhaust if it sat with a full tank of gas and it seeped past the needle/seat assy and ran into the crankcase. When you tear into it to change the seals, you may need to do some cleanup inside the case. In the meantime, I'd go ahead and try to get it fired up, providing the seal appears to be where they belong.
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