Is this the magnum version?

Here's from a Mopar Muscle article where the dynoed a 360/380 magnum crate.

"Complete From Oil Pan To Intake, The Crate Just Needs Accessories, Pulleys, Carb, Headers, Plugs And Wires, And It's Ready To Fire. The 360 Magnum Has A Specific Balance Factor, Different From The Earlier 360s. The Damper Comes With It, But The Flywheel, Flexplate, Or Converter Does Not. When Ordering, Be Sure To Specify Magnum Balance."

http://www.hotrod.com/articles/mopp-0303...e_buildup-crate