Just as a point of reference to how good the magnum head is;

I have a LA360 block with KB107 pistons at zero deck, an 0.039" thick head gasket and magnum heads which cc'd at 64. This gives me a static compression ratio of 10.6:1. I am using a Comp XE268H cam (224/230 @ 0.050, .509/.512, 110). With this cam I have 180-195 psi of cranking pressure.

I run the engine on 89 octane and in a pinch I have used 87 but have to be careful getting on it below 3000 rpm.

The engine pulls strong from 1500 rpm and runs out of steam just over 6500 rpm and I cruise in 4th of an A833OD/3.55/27" combo at 1300-1400 rpm. It accelerates away smoothly and cleanly. Based on 1/4 mile trap speeds I am making about 370HP with this engine and Comps Cam quest estimates the power at 410 HP.

This is in a 68 Barracuda that weights about 3600 lbs with me in it.

For a torque monster one of the smaller Comp XE cams or euivalent Voodoos would be the hot ticket but they will raise the cranking pressure to. Maybe enough to warrant starting with a slightly lower static compression ratio. Keith Black has a step dish piston just for the magnum head that will allow you to maintain the tight quench of zero deck on the closed side of the chamber with a dish area under the plug and valves for lower compression.