Anyone here ever have their pistons machined?

I noticed that when I pulled the header gaskets off the heads, the gaskets were at least 3/16" bigger than the exhaust ports. A gasket match there would really help, right? I have 2" TTI headers and use their gaskets.
The intake ports in the heads are not any smaller than the steel valley pan. If the intake ports are hogged out, I guess I'd need to file the valley pan ports to keep from being a restriction.