Stock valve springs with this cam?

Yes you will need new springs with the magnum heads too, even more so with the additional lift from the magnum 1.6 ratio rockers. You are some what limited in spring choices for the magnum head too. Mopar Performance has two and comp has a new drop in behive spring for the magnum head now too. Also, there was a thread on another board where some one had used 3.8l GM v6 springs. In all cases you will need new retainers to because none of the springs are compatible with the stock magnum beehive size retainer.

You either need to have the heads drilled to accept an LA intake or get a magnum specific intake. And of course you need the magnum rocker gear.