383 power upgrade help

Okay so most the info I've received is that I should only go aluminum if I need that preformance otherwise stick with the 516's and port em does anyone know roughly the cost that would be or the cost to port 440 stealth heads? I think the power goal that I'm looking to get is achievable by just doing intake headers and a cam but if I can do something to the heads aswell that would be nice and can I have get some of yalls opinions on cams for this build based on what you know about what I'll be putting it on what fo you think is s reasonable cam choice