Pre Magnum stock roller cam specs?

Are there any off the shelf cams that will work with the stock heads?
This is the "get me by" motor, but damn it would be nice to at least have a little more power and a small lope.

Well, you're probably not going to get much under .420 lift. Even the smallest off the shelf cams from comp and crane would be pushing it. Have you asked your machinist about shimming the springs so you can get a more decent bumpstick?