You're in California? Just go to LKQ on their 40% off days an you can pull a whole Magnum motor WITH accessories for about 200 to 300 bucks (that includes the core charge and taxes). There are a ton of Magnums in the wrecking yard. It's a shame that most of them get crushed.
Just monitor this page:
Auto Parts Sale | LKQ Pick Your Part
At the time I write this, there seems to be a sale go on March 17th to 18th.