5.9 Magnum Torque motor build?

A Magnum engine is already a roller cam so a new cam brings in to many complex calculations to give a answer never mind an accurate one based on assumptions. There are just to many variables.

The best way you can partially predict power is through a simple desk top dyno program and start entering cam specs. The program is good and best used as a learning tool. This way you can see how various camshafts can react and dish out the power.