need to learn about camshafts....

I have a 300 hp crate 360 magnum engine, i'm trying to determin what the best camshaft would be for low to mid range torque, for this engine is in my half ton four wheel drive truck. I need to be schooled on camshafts and camshafts sizes and what sizes provide torque and what cams provide horse power.
I dont know anything aabout cams and i wanna learn. I'm looking for a camshaft thats going to provide real good low to mid range torque.