There are a lot of guys doing this on the Dakota website. They are running a stock 5.2L Magnum with a supercharger, they are a lot heavier and running very low 13's.
A stock 5.2 is a way better performer than a lo-po '71 318. The Magnum heads are more efficient than most of what Chrysler put out in the '70s. The EQ and the RHS/Indy heads are both based on the Magnum design.