I've probably bought 10-12 JDM engines and every single one of them had the oil pan punched in at the pickup location. They all need a new pan or at very minimum take the pan off and knock that area back down with a wood or plastic punch. OR, take that pan off the removal engine. They will die a slow (or quick) death from oil starvation if you don't fix this issue. I usually find that they need main and rod bearings anyway.