Instead of port-matching the headers so that I could put them on the car permanently, I decided to start the car up to see how it sounded.
Now the headers are too hot to touch, although the car was quieter than I expected with open headers. I want to get a video, but the microphone on my camera is non-functional (I think that I forgot to reconnect it last time I had it apart), so it would be a silent video of the engine running.
Running the engine did turn the headers a nice shade of golden brown.
Hopefully pictures of port matching later.