The oil pan must be carefully fit to your engine. The casting in the oil seal ends of the pan are very rough. Use a one piece FelPro oil pan gasket.
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You must carefully "sand" the oil pan to timing case cover and main cap areas to ensure they are smooth, and the pan will compress and not rip or move the oil pan end gasket as it is tightened. I installed one of these and painstakingly smoothed and fit it dry before the final installation or tightening. This was on an engine stand not in the car. It can be done in the car and the "4" oil pan "leads" are a god sent to ensurine all line up when installing! I had zero leaks!
Rob