MPG Motor Magnum vs. Hemi

Holy hell! you guys make me realize how little I know. I've been researching camshafts and still have a hard time understanding exactly what I'm looking for in a cam as far as duration, lift, cylinder pressure etc...

You and me both. The more you know, the more you realize how little you know sometimes. I know enough to pick a good cam grind for the street engines I build, but not a clue when it comes to actually designing a custom one like these guys are talking about.