So the head is back from it's compromised valve job. Yep, and making it better 
Photo below shows the head sporting its new valve job, and it's compromise. The compromise is the top cut couldn't be any larger, or smoother do to the head gasket fire ring placement. One area NOT to be compromised!
The results is a top cut that is only .050" wide, and is "sunken" into the chamber by .062"!
Using a 1/8" "tree" burr as a file, I slowly reshape the ledge
With the ledge now removed, flow should be undisturbed
more to come....
