What is the horse power benefits

I have a 5.2 Magnum I want to build. I'm not worried about gas mileage. I do like the improved torque and stock converter idea. I'm looking at aftermarket heads and intake with AVS carb as per the Magnum Swap site, as well as going to LA accessories. The stock cam is a little rough, so I'm thinking a regrind from Oregon. Any ideas on the specs for a better than average build in say a 72 Demon with a 904 and 3.55 Suregrip?