Porting Edelbrock 6037 heads, Thoughts?

[mufflerboy]

I have a small oil leak from my head gasket that want to fix. While the heads were off I was thinking of having them ported. Would it be worth it to gasket match and give them a general clean up, I m also going to send in my Cobra lower if I do it. I also think that my valve springs might be getting weak, so I'll replace them too.Is there much power gain from doing this will it be worth the time and money.