If you didn't get a bar chart with the head work, how do you know anything about them? Did you just walk in and tell the guy to grind on 'em and you would hand him money?
Scroll down and look at this orange and blue bar chart from Racing Head Service. This is what I would expect to see when I picked my heads up and I would expect it to reflect some improvement over stock for my money. If you didn't see a before and after comparison of the flow, the heads could be worse now than they were stock. I hope you see where I'm coming from with this.
If you flew into this whole head porting thing blindly, you have more money to waste than I do.