All oil pans are vatted, and checked for defects that would cause them to be unusable, such as excessive rust on sealing surfaces, cracks, holes, and severe warpage. These are 30-40 year old sheet metal parts, and are not perfect.
Sometimes we have nice pans. Sometimes we have fairly rough pans for a lower price (needing some elbow grease before use, but not requireing welding, etc). Sometimes we have both, and sometimes we have neither
Note: ’77-up oil pans may require clearancing to clear the stroke of a 500.