Here's the flow comparison:
Some pictures I have of the head:
Close up of work done behind the valve seat
Before work in the combustion chamber
After work in the combustion chamber
Some mild port work, You can see about mid-tunnel the casting is still there. Thinking back, I wish I would have cleaned that up a bit.
As you can see the RWD highport is very similar to the FWD highport heads. I think the only difference is location of the distributor/CAM angle sensor and the timing chain chamber at the from is larger on the RWD heads (again for the difference of sensor location).
Supertech Valve Guides
These are Ferrea +1mm valves (WPC treated)
Sorry the pictures aren't fantastic, but hopefully it gives you a little idea of what I had done.
Edit:
Oh and for what it's worth, here's my dyno sheet to show power band (although it's a turbo, not N/A) with Tomei 260 duration / 12mm lift cams with solid lifters and a Greddy intake manifold (shorter/larger runners and larger plenum):