Destroyed 440

Would anyone recommend different heads if I wish to achieve 400+ hp? I don't intend on racing the car but it still needs some muscle. I was looking at the stealth aluminum heads on 440source, price seems good but is it worth replacing the ones off that '78? I'm looking at having my shop put in comp cam's 507 over whatever "mild" cam is in it now. (the guy didn't know for sure)