Those are opened up at the windows, but that's about it. The chambers are std.
You can port all you want and itll only get better above .450 'somewhat' because the ledge below the short side in the chamber.
That aside..
That was good deal too! I remember it on here somewhere for like a grand or something.
Yes. The machine work and porting looks good but like you said porting alone isn't the key. I have a local machine shop that does a lot of circle track heads. The rules don't allow porting but a good valve job and a back cut on the valve sure helps.