1971 Dodge Dart Swinger
Hey, I've got a '71 Dart too. LOL
You need the pickup in addition to the oil pan.
If you run into trouble with other stuff, check this out:
http://www.magnumswap.com/
I'd been answering a lot of questions so I threw this together. If you run into trouble that isn't on the site, feel free to PM me.
Good luck!
Steve