Scott,
Porting too much can be very detrimental to flow numbers.. If you're staying N/A I would suggest port matching and just sanding all the burrs out of the casting. Porting is something you REALLY need to understand to see benefit.
I see it happen all the time, especially on the large-port 4AG heads, where even performance shops are making changes to heads that only hurts flow and causes poor atomization before it gets to the cylinders for combustion. I get the idea that you're much like me, and really don't like other people doing the work I feel I could do myself, but this is something I would just leave to someone who has a lot of experience and can properly bench flow test your heads.
Take Rob's advice, he's spot on.