Probably an aluminum 225 or an iron 170, but not an aluminum 170. There were a (very) few aluminum 170 prototypes in 1960, and a couple of those were installed in factory-owned cars leased to Chrysler Engineering employees for "real world" tests, but no aluminum 170s were made on a production basis. There were over 50,000 aluminum 225s made between mid '61 and early '63.
The oil pan you need is a '60-'66 A-body item as per that slantsix.org link.
