If you feel confident at all with a dremel and sanding drums, I would match port and polish the intakes and exhaust. I am stealing some quotes from johnny 5, bur a little out of order.
"The intake spacer was offset from the head port so that was matched up first by opening the spacer to the head. The rough edges in the ports were cleaned up. Basically any bumps or flaws from the casting were removed. "
You can use a dremel with various sizes sanding drums for this.
" I didnt open the port diameters just removed the rough spots and smoothed out the transition and the back side of the valve area that was cut out and looked unfinished due to mass production of these heads."
This alone can make a huge difference. There are usually a lot of flash and casting inperfections that can mess up flow.
"I put duct tape strips on the valve seats to be safe." You really want to do this. sometimes the dremel will try and get away from you or chatter. The sanding drums will not usually go through the duct tape, so it protects the seats really well.
Have fun
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