Cheapest way to make 300 crank hp from a 5.2 magnum

Hey guys, I'm getting ready to really tear into my 5.2 and start doing some upgrades. I already have an air gap intake on order, and I'm planning to use this cam http://m.summitracing.com/parts/cca-20-746-9 . I also plan on using the exhaust manifolds of of this motor, which should flow pretty well. I plan on having the heads cleaned up and replaceing the springs, I might attempt a gasket match on the intake and exhaust ports. Anyone have some input?