Cheapest way to make 300 crank hp from a 5.2 magnum

Alrighty, so I ended up having my stock cam reground to .224/224 at .050 and 496/496 lift at 1.6 with a 112 lsa. Also decided to do a bit of porting on my stock heads with my friend Logan, nothing too fancy, just cleaning up the guide bosses and some smoothing here and there. Possibly also gasket matching both intake and exhaust ports. Pushing for 1hp per cube at the flywheel!