Finally got some pics to put up for TNYoungblood's 540 build.
Basically start with this:
Vallve seats bored to the proper ID and the bowls roughed in:
Once the bowls are done, I start on the ports. Sometimes I have both heads on the bench making sure they're as close as possible to being the same. Measure and grind...measure and grind...
Doing some area correction at the short turn. It's hard to tell, but I removed .100" from the roof of the port and around the guide boss, and about .030 from each side. Thhis also gives me a chance to contour the guide boss a little.
I pretty much finish the ports, then I do the valve job and chambers get roughed in: