Those pics are too small. I can't tell if the ports have been machined.
I was under the assumption that those heads/cams were new and unused. That obviously is not the case.
Keep looking. A while back, I found a set of very low mileage ported PI heads for $300.
The main advantage with buying brand new ported heads is that they have been updated with the better spark plug threads to prevent blowouts.
So, for that reason, it would be preferable to get some upgraded heads rather than porting the ones on your 99.