Mopar Magnum

While you're educating yourself on Mopar engines and figuring out what you have, get some headers on that thing! Judging from looks (mainly the single-plane intake) you would probably pick up around 30+ HP with a set of TTI or Doug's headers.

A good place to start for info is the Mopar Performance Engines manual, you can get them for $10 online. Check out manciniracing.com