Good mods to make torque in a 440

I have 516 heads with stainless 1.74 exhaust valves and hardened seats. 2.08 intake valves for street. Perfect Circle valve seals, unmilled heads with bowl work. Comp springs. I invested $600 in heads. I told the head man not to exceed that amount. Any more expence and I would invest in Edelbrocks. As far as a cam is concerned, the MP Magnum cam can't be beat and the price is spot on. Hope this helps. Oh, I forgot, CHECK EVERYTHING